TY - JOUR AU - Caruana, N. AU - Nalepka, P. AU - Perez, G.A. AU - Inkley, C. AU - Munro, C. AU - Rapaport, H. AU - Brett, S. AU - Kaplan, D.M. AU - Richardson, M.J. AU - Pellicano, E. TI - Autistic young people adaptively use gaze to facilitate joint attention during multi-gestural dyadic interactions JF - AUTISM J2 - AUTISM PY - 2023 SN - 1362-3613 DO - 10.1177/13623613231211967 UR - https://m2.mtmt.hu/api/publication/34450170 ID - 34450170 LA - English DB - MTMT ER - TY - JOUR AU - de la Garanderie, Marie Payen AU - Courtay, Aymeric AU - Feral-Basin, Camille AU - Rainville, Pierre AU - Gaveau, Jeremie AU - Pageaux, Benjamin TI - Perception of effort and the allocation of physical resources: A generalization to upper-limb motor tasks JF - FRONTIERS IN PSYCHOLOGY J2 - FRONT PSYCHOL VL - 13 PY - 2023 PG - 24 SN - 1664-1078 DO - 10.3389/fpsyg.2022.974172 UR - https://m2.mtmt.hu/api/publication/33839522 ID - 33839522 AB - PurposeThe perception of effort (PE) is widely used to prescribe and monitor exercise during locomotor and resistance tasks. The present study examines the validity of PE to prescribe and monitor exercise during upper-limb motor tasks under various loads and speed requirements. MethodsForty participants volunteered in two experiments. In experiment 1, we used four PE intensities to prescribe exercise on a modified version of the box and block test (BBT) and a pointing task. We investigated the possibility of monitoring the exercise intensity by tracking changes in PE rating in response to three different tempos or additional weights. Experiment 2 replicated the possibility of prescribing the exercise with the PE intensity during the BBT and explored the impact of additional weights on performance and PE during the standardized version of the BBT. Muscle activation, heart rate, and respiratory frequencies were recorded. ResultsIn experiment 1, increasing the PE intensity to prescribe exercise induced an increased performance between each intensity. Increasing task difficulty with faster movement tempo and adding weight on the forearm increased the rating of PE. Experiment 2 replicated the possibility to use PE intensity for exercise prescription during the BBT. When completing the BBT with an additional weight on the forearm, participants maintained performance at the cost of a higher PE. In both experiments, changes in PE were associated with changes in muscle activation. ConclusionOur results suggest that PE is a valid tool to prescribe and monitor exercise during upper-limb motor tasks. LA - English DB - MTMT ER - TY - JOUR AU - Kimura, A. AU - Nakashima, H. AU - Inaba, Y. TI - Biomechanical role can vary depending on the conditions of the motor task JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 92 PY - 2023 SN - 0167-9457 DO - 10.1016/j.humov.2023.103150 UR - https://m2.mtmt.hu/api/publication/34450169 ID - 34450169 LA - English DB - MTMT ER - TY - JOUR AU - Latash, Mark L. TI - Optimality, Stability, and Agility of Human Movement: New Optimality Criterion and Trade-Offs JF - MOTOR CONTROL J2 - MOTOR CONTROL VL - 27 PY - 2023 IS - 1 SP - 123 EP - 159 PG - 37 SN - 1087-1640 DO - 10.1123/mc.2021-0135 UR - https://m2.mtmt.hu/api/publication/33839523 ID - 33839523 AB - This review of movement stability, optimality, and agility is based on the theory of motor control with changes in spatial referent coordinates for the effectors, the principle of abundance, and the uncontrolled manifold hypothesis. A new optimality principle is suggested based on the concept of optimal sharing corresponding to a vector in the space of elemental variables locally orthogonal to the uncontrolled manifold. Motion along this direction is associated with minimal components along the relatively unstable directions within the uncon-trolled manifold leading to a minimal motor equivalent motion. For well-practiced actions, this task-specific criterion is followed in spaces of referent coordinates. Consequences of the suggested framework include trade-offs among stability, optimality, and agility, unintentional changes in performance, hand dominance, finger specialization, individual traits in performance, and movement disorders in neurological patients. LA - English DB - MTMT ER - TY - JOUR AU - Shoja, O. AU - Shojaei, M. AU - Hassanlouei, H. AU - Towhidkhah, F. AU - Amiri, M. AU - Boroomand, H. AU - Rahimi, N. AU - Zhang, L. TI - Lack of visual information alters lower limb motor coordination to control center of mass trajectory during walking JF - JOURNAL OF BIOMECHANICS J2 - J BIOMECH VL - 155 PY - 2023 SN - 0021-9290 DO - 10.1016/j.jbiomech.2023.111650 UR - https://m2.mtmt.hu/api/publication/34030003 ID - 34030003 LA - English DB - MTMT ER - TY - JOUR AU - Caruana, N. AU - Inkley, C. AU - Nalepka, P. AU - Kaplan, D.M. AU - Richardson, M.J. TI - Gaze facilitates responsivity during hand coordinated joint attention JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 11 PY - 2021 IS - 1 SN - 2045-2322 DO - 10.1038/s41598-021-00476-3 UR - https://m2.mtmt.hu/api/publication/32698238 ID - 32698238 LA - English DB - MTMT ER - TY - JOUR AU - Kimura, A. AU - Yokozawa, T. AU - Ozaki, H. TI - Clarifying the Biomechanical Concept of Coordination Through Comparison With Coordination in Motor Control JF - FRONTIERS IN SPORTS AND ACTIVE LIVING J2 - FRONT SPORTS ACT LIVING VL - 3 PY - 2021 SN - 2624-9367 DO - 10.3389/fspor.2021.753062 UR - https://m2.mtmt.hu/api/publication/32698242 ID - 32698242 LA - English DB - MTMT ER - TY - JOUR AU - Latash, ML TI - One more time about motor (and non-motor) synergies JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 239 PY - 2021 SP - 2951 EP - 2967 PG - 17 SN - 0014-4819 DO - 10.1007/s00221-021-06188-4 UR - https://m2.mtmt.hu/api/publication/32175523 ID - 32175523 LA - English DB - MTMT ER - TY - JOUR AU - Robalo, R. AU - Diniz, A. AU - Milho, J. AU - Pitacas, P. AU - Passos, P. TI - Are synergies continuously present in cyclical movements? An example with the basketball dribble task JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 80 PY - 2021 SN - 0167-9457 DO - 10.1016/j.humov.2021.102883 UR - https://m2.mtmt.hu/api/publication/32698241 ID - 32698241 LA - English DB - MTMT ER - TY - JOUR AU - Beerse, Matthew AU - Bigelow, Kimberly E. AU - Barrios, Joaquin A. TI - The patterning of local variability during the acquisition of a novel whole-body continuous motor skill in young adults JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 238 PY - 2020 IS - 9 SP - 1797 EP - 1812 PG - 16 SN - 0014-4819 DO - 10.1007/s00221-020-05840-9 UR - https://m2.mtmt.hu/api/publication/31415012 ID - 31415012 AB - There is increasing evidence that movement variability during motor skill acquisition plays a functional role. Specifically, initial variability might represent exploration of the possible motor space for solutions and error identification. Following practice, individuals might exploit a reduced amount of motor solutions to execute the task. While this variability pattern has been supported during discrete upper limb and multi-finger force tasks, there is a paucity of evidence for continuous whole-body motor tasks. Therefore, the purpose of this study was to characterize the role of variability during the acquisition of a whole-body continuous motor task across practice sessions in young adults. Twelve young adults aged 18-35-years participated in this study. Subjects practiced a novel, sagittal plane task, the kettlebell swing, using an online training video. We conducted an uncontrolled manifold analysis to partition local variability of the configuration of the kettlebell and body segments based on their impact on the position of the center-of-mass (COM) in the sagittal plane. Our results demonstrated that following initial practice, variability that did not affect the COM position remained elevated, suggesting sustained exploration of motor solutions. Following multiple practice sessions, variability related to motor solutions decreased, potentially indicating exploitation. The results from this study support the proposal that young adults initially utilize a range of motor solutions when acquiring a whole-body motor skill, followed by exploitation of stereotypic movement. LA - English DB - MTMT ER - TY - JOUR AU - de Lemos Fonseca, Marcus AU - Daneault, Jean-Francois AU - Vergara-Diaz, Gloria AU - Quixada, Ana Paula AU - Souza de Oliveira e Torres, Angelo Frederico AU - Ponde de Sena, Eduardo AU - Bomfim Cruz Vieira, Joao Paulo AU - Bigogno Reis Cazeta, Bianca AU - Sotero dos Santos, Vitor AU - da Cruz Figueiredo, Thiago AU - Pena, Norberto AU - Bonato, Paolo AU - Vivas Miranda, Jose Garcia TI - Motor skill acquisition during a balance task as a process of optimization of motor primitives JF - EUROPEAN JOURNAL OF NEUROSCIENCE J2 - EUR J NEUROSCI VL - 51 PY - 2020 IS - 10 SP - 2082 EP - 2094 PG - 13 SN - 0953-816X DO - 10.1111/ejn.14649 UR - https://m2.mtmt.hu/api/publication/31415010 ID - 31415010 AB - It has been argued that the central nervous system relies on combining simple movement elements (i.e. motor primitives) to generate complex motor outputs. However, how movement elements are generated and combined during the acquisition of new motor skills is still a source of debate. Herein, we present results providing new insights into the role of movement elements in the acquisition of motor skills that we obtained by analysing kinematic data collected while healthy subjects learned a new motor task. The task consisted of playing an interactive game using a platform with embedded sensors whose aggregate output was used to control a virtual object in the game. Subjects learned the task over multiple blocks. The analysis of the kinematic data was carried out using a recently developed technique referred to as "movement element decomposition." The technique entails the decomposition of complex multi-dimensional movements in one-dimensional elements marked by a bell-shaped velocity profile. We computed the number of movement elements during each block and measured how closely they matched a theoretical velocity profile derived by minimizing a cost function accounting for the smoothness of movement and the cost of time. The results showed that, in the early stage of motor skill acquisition, two mechanisms underlie the improvement in motor performance: 1) a decrease in the number of movement elements composing the motor output and 2) a gradual change in the movement elements that resulted in a shape matching the velocity profile derived by using the above-mentioned theoretical model. LA - English DB - MTMT ER - TY - JOUR AU - Liu, Chang AU - Finley, James M. TI - Asymmetric gait patterns alter the reactive control of intersegmental coordination patterns in the sagittal plane during walking JF - PLOS ONE J2 - PLOS ONE VL - 15 PY - 2020 IS - 5 PG - 17 SN - 1932-6203 DO - 10.1371/journal.pone.0224187 UR - https://m2.mtmt.hu/api/publication/31415011 ID - 31415011 AB - Recovery from perturbations during walking is primarily mediated by reactive control strategies that coordinate multiple body segments to maintain balance. Balance control is often impaired in clinical populations who walk with spatiotemporally asymmetric gait, and, as a result, rehabilitation efforts often seek to reduce asymmetries in these populations. Previous work has demonstrated that the presence of spatiotemporal asymmetries during walking does not impair the control of whole-body dynamics during perturbation recovery. However, it remains to be seen how the neuromotor system adjusts intersegmental coordination patterns to maintain invariant whole-body dynamics. Here, we determined if the neuromotor system generates stereotypical coordination patterns irrespective of the level of asymmetry or if the neuromotor system allows for variance in intersegmental coordination patterns to stabilize whole-body dynamics in the sagittal plane. Nineteen healthy participants walked on a dual-belt treadmill at a range of step length asymmetries, and they responded to unpredictable, slip-like perturbations. We used principal component analysis of segmental angular momenta to characterize intersegmental coordination patterns before, during, and after imposed perturbations. We found that two principal components were sufficient to explain similar to 95% of the variance in segmental angular momentum during both steady-state walking and responses to perturbations. Our results also revealed that walking with asymmetric step lengths led to changes in intersegmental coordination patterns during the perturbation and during subsequent recovery steps without affecting whole-body angular momentum. These results suggest that the nervous system allows for variance in segment-level coordination patterns to maintain invariant control of whole-body angular momentum during walking. Future studies exploring how these segmental coordination patterns change in individuals with asymmetries that result from neuromotor impairments can provide further insight into how the healthy and impaired nervous system regulates dynamic balance during walking. LA - English DB - MTMT ER - TY - JOUR AU - Lokesh, Rakshith AU - Ranganathan, Rajiv TI - Haptic Assistance That Restricts the Use of Redundant Solutions is Detrimental to Motor Learning JF - IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING J2 - IEEE T NEUR SYS REH VL - 28 PY - 2020 IS - 6 SP - 1373 EP - 1380 PG - 8 SN - 1534-4320 DO - 10.1109/TNSRE.2020.2990129 UR - https://m2.mtmt.hu/api/publication/31415014 ID - 31415014 AB - Understanding the use of haptic assistance to facilitate motor learning is a critical issue, especially in the context of tasks requiring control of motor variability. However, the question of how haptic assistance should be designed in tasks with redundancy, where multiple solutions are available, is currently unknown. Here we examined the effect of haptic assistance that either allowed or restricted the use of redundant solutions on the learning of a bimanual steering task. 60 college-aged participants practiced steering a single cursor placed in between their hands along a smooth W-shaped track of a certain width as quickly as possible. Haptic assistance was either applied at (i) the 'task' level using a force channel that only constrained the cursor to the track, allowing for the use of different hand trajectories, or (ii) the 'individual effector' level using a force channel that constrained each hand to a specific trajectory. In addition, we also examined the effect of simply 'fading' assistance in a linear fashion- i.e., decreasing force gains with practice to reduce dependence on haptic assistance. Results showed all groups improved with practice - however, groups with haptic assistance at the individual effector level performed worse than those at the task level. Besides, we did not find sufficient evidence for the benefits of linearly fading assistance in our task. Overall, the results suggest that haptic assistance is not effective for motor learning when it restricts the use of redundant solutions. LA - English DB - MTMT ER - TY - JOUR AU - Michalski, Julien AU - Green, Andrea M. AU - Cisek, Paul TI - Reaching decisions during ongoing movements JF - JOURNAL OF NEUROPHYSIOLOGY J2 - J NEUROPHYSIOL VL - 123 PY - 2020 IS - 3 SP - 1090 EP - 1102 PG - 13 SN - 0022-3077 DO - 10.1152/jn.00613.2019 UR - https://m2.mtmt.hu/api/publication/31415013 ID - 31415013 AB - Neurophysiological studies suggest that when decisions are made between concrete actions, the selection process involves a competition between potential action representations in the same sensorimotor structures involved in executing those actions. However, it is unclear how such models can explain situations, often encountered during natural behavior, in which we make decisions while were are already engaged in performing an action. Does the process of deliberation characterized in classical studies of decision-making proceed the same way when subjects are deciding while already acting? In the present study, human subjects continuously tracked a target moving in the horizontal plane and were occasionally presented with a new target to which they could freely choose to switch at any time, whereupon it became the new tracked target. We found that the probability of choosing to switch increased with decreasing distance to the new target and increasing size of the new target relative to the tracked target, as well as when the direction to the new target was aligned (either toward or opposite) to the current tracking direction. However, contrary to our expectations, subjects did not choose targets that minimized the energetic costs of execution, as calculated by a biomechanical model of the arm. When the constraints of continuous tracking were removed in variants of the task involving point-to-point movements, the expected preference for lower cost choices was seen. These results are discussed in the context of current theories of nested feedback control, internal models of forward dynamics, and high-dimensional neural spaces.NEW & NOTEWORTHY Current theories of decision-making primarily address how subjects make decisions before executing selected actions. However, in our daily lives we often make decisions while already performing some action (e.g., while playing a sport or navigating through a crowd). To gain insight into how current theories can be extended to such "decide-while-acting" scenarios, we examined human decisions during continuous manual tracking and found some intriguing departures from how decisions are made in classical "decide-then-act" paradigms. LA - English DB - MTMT ER - TY - JOUR AU - Argaud, Sebastien AU - de Fontenay, Benoit Pairot AU - Blache, Yoann AU - Monteil, Karine TI - Age-related differences of inter-joint coordination in elderly during squat jumping JF - PLOS ONE J2 - PLOS ONE VL - 14 PY - 2019 IS - 9 PG - 13 SN - 1932-6203 DO - 10.1371/journal.pone.0221716 UR - https://m2.mtmt.hu/api/publication/31564540 ID - 31564540 AB - BackgroundExplosive movement requires that the individual exerts force and power with appropriate magnitude and timing. These coordination aspects have received less attention despite being a basic prerequisite for daily mobility and physical autonomy, especially in older people. Therefore, the purpose of this study is to characterize the effect of age on inter-joint coordination during explosive movement.MethodsTwenty-one elderly and twenty young participants performed three maximal vertical jumps, while kinematics were recorded throughout each squat jump. Inter-joint coordination and coordination variability were calculated for selected sagittal hip-knee, knee-ankle, and hipankle joint couplings using the continuous relative phase method.ResultsThe young participants produced significantly greater jump height performance (0.36 +/- 0.07 m vs. 0.12 +/- 0.04 m, p < 0.001). The mean absolute continuous relative phase for ankleknee and knee-hip joint couplings were significantly greater for the elderly in comparison to the young group (p < 0.01 for the both). No significant differences between senior and young participants in the mean absolute continuous relative phase for ankle-hip joint couplings (p = 0.25) was observed. However, there was significantly more variability in interjoint coordination in the elderly marked by greater continuous relative phase variabilities in ankle-knee, ankle-hip and knee-hip joint couplings (p < 0.001) than those observed in young adults.ConclusionIn this study, seniors demonstrated proximodistal inter-joint coordination but with different delays in the pattern of inter-joint coordination during squat jumps compared to young adults. In addition, a higher continuous relative phase variability in the elderly may be needed to improve stability or compensate for strength deficits in jump achievement. LA - English DB - MTMT ER - TY - JOUR AU - Buzzi, Jacopo AU - De Momi, Elena AU - Nisky, Ilana TI - An Uncontrolled Manifold Analysis of Arm Joint Variability in Virtual Planar Position and Orientation Telemanipulation JF - IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING J2 - IEEE T BIO-MED ENG VL - 66 PY - 2019 IS - 2 SP - 391 EP - 402 PG - 12 SN - 0018-9294 DO - 10.1109/TBME.2018.2842458 UR - https://m2.mtmt.hu/api/publication/30457453 ID - 30457453 AB - Objective: In teleoperated robot-assisted tasks, the user interacts with manipulators to finely control remote tools. Manipulation of robotic devices, characterized by specific kinematic and dynamic proprieties, is a complex task for the human sensorimotor system due to the inherent biomechanical and neuronal redundancies that characterize the human arm and its control. We investigate how master devices with different kinematics structures and how different task constraints influence users capabilities in exploiting arm redundancy. Methods: A virtual teleoperation workbench was designed and the arm kinematics of seven users was acquired during the execution of two planar virtual tasks, involving either the control of position only or position-orientation of a tool. Using the uncontrolled manifold analysis of arm joint variability, we estimated the logarithmic ratio between the task irrelevant and the task relevant manifolds (R-v). Results: The R-v values obtained in the position-orientation task were higher than in the position only task, while no differences were found between the master devices. A modulation of R-v was found through the execution of the position task and a positive correlation was found between task performance and redundancy exploitation. Conclusion: Users exploited additional portions of arm redundancy when dealing with the tool orientation. The R-v modulation seems influenced by the task constraints and by the users possibility of reconfiguring the arm position. Significance: This paper advances the general understanding of the exploitation of arm redundancy in complex tasks, and can improve the development of future robotic devices. LA - English DB - MTMT ER - TY - JOUR AU - Greve, Christian AU - Hortobágyi, Tibor AU - Bongers, Raoul M. TI - Flexibility in joint coordination remains unaffected by force and balance demands in young and old adults during simple sit-to-stand tasks JF - EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY J2 - EUR J APPL PHYSIOL VL - 119 PY - 2019 IS - 2 SP - 419 EP - 428 PG - 10 SN - 1439-6319 DO - 10.1007/s00421-018-4035-4 UR - https://m2.mtmt.hu/api/publication/30457452 ID - 30457452 AB - PurposeWe examined the possibility that old adults use flexibility in joint coordination as a compensatory mechanism for the age-related decline in muscle strength when performing the sit-to-stand (STS) task repeatedly under high force and balance demands.MethodYoung (n=14, 22.42.1) and old (n=12, 703.2) healthy adults performed repeated STSs under high and low force and balance demands. The balance demand was manipulated by reducing the base of support and the force demand by increasing body weight with a weight vest. Uncontrolled manifold analysis was used to quantify age differences in motor flexibility.Results p id= Par3 While there were age-typical differences in kinematic STS strategies, flexibility in joint coordination was independent of age and task difficulty during repeated STSs.Discussion p id=Par4That simple manipulations of force and balance demands did not affect flexibility in joint coordination in old and young adults suggests that motor flexibility acts as a compensatory mechanism only at the limits of available muscle strength and balance abilities during STS movements. Intervention studies should identify how changes in specific neuromuscular functions affect flexibility in joint coordination during activities of daily living such as STS. LA - English DB - MTMT ER - TY - JOUR AU - Lokesh, Rakshith AU - Ranganathan, Rajiv TI - Differential control of task and null space variability in response to changes in task difficulty when learning a bimanual steering task JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 237 PY - 2019 IS - 4 SP - 1045 EP - 1055 PG - 11 SN - 0014-4819 DO - 10.1007/s00221-019-05486-2 UR - https://m2.mtmt.hu/api/publication/30682500 ID - 30682500 AB - The presence of motor redundancy means that movement variability can be split into a 'task-space' component that affects task performance, and a 'null space' component which has no effect on task performance. While the control of task-space variability during learning is essential, because it is directly linked to performance, how the nervous system controls null space variability during learning has not been well understood. One factor that has been hypothesized to govern the change in null space variability with learning is task difficulty, but this has not been directly tested. Here, we examined how task difficulty influences the change in null space variability with learning. Healthy, college-aged participants (N = 36) performed a bimanual steering task, where they steered a cursor through a smooth W-shaped track of a certain width as quickly as possible while attempting to keep the cursor within the track. Task difficulty was altered by changing the track width and participants were split into one of the three groups based on the track width that they practiced on-wide, narrow, or progressive (where the width of the track progressively changed from wide to narrow over practice). The redundancy in this task arose from the fact that the position of the cursor was defined as the average position of the two hands. Results showed that movement time depended on task difficulty, but all groups were able to decrease their movement time with practice. Learning was associated with a reduction in null space variability in all groups, but critically, there was no effect of task difficulty. Further analyses showed that while the task-space variability showed an expected speed-accuracy tradeoff with movement time, the null space variability showed a qualitatively different pattern. These results suggest differential control of task and null space variability in response to changes in task difficulty with learning, and may reflect a strong preference to minimize overall movement variability during learning. LA - English DB - MTMT ER - TY - JOUR AU - Pacheco, Matheus M. AU - Lafe, Charley W. AU - Newell, Karl M. TI - Search Strategies in the Perceptual-Motor Workspace and the Acquisition of Coordination, Control, and Skill JF - FRONTIERS IN PSYCHOLOGY J2 - FRONT PSYCHOL VL - 10 PY - 2019 PG - 24 SN - 1664-1078 DO - 10.3389/fpsyg.2019.01874 UR - https://m2.mtmt.hu/api/publication/30898027 ID - 30898027 N1 - Funding Agency and Grant Number: CAPES (Ministry of Education - Brazil) [PNPD/CAPES 2019] Funding text: MP is funded as a postdoctoral fellow by the CAPES (Ministry of Education - Brazil) (PNPD/CAPES 2019). AB - In this paper we re-visit and elaborate-on the theoretical framework of learning as searching within the perceptual-motor workspace for a solution to the task. The central focus is the nature of search strategies to locate and create stable equilibrium regions in the perceptual-motor workspace and how these strategies relate to the emergent movement forms in the acquisition of coordination, control, and skill. In the ecological theory of perception and action, the enhanced stability of performance occurs through the attunement of the perceptual systems to the task dynamics together with modifications of action as task and intrinsic dynamics cooperate and/or compete. Thus, through practice in this search process, individuals adapt to the pick-up of task relevant perceptual variables and change their movement form according to the stability of the performed action and its outcome in relation to the task demands. Contemporary experimental findings have revealed features of the search process given the interaction of individual intrinsic dynamics in the context of task requirements and principles that drive the change - e.g., exploitation of more tolerant task-space solutions and emergence of compensatory mechanisms. Finally, we outline how the search strategy framework relates to traditional learning-related phenomena: including the dynamical pathways of learning, learning curves, factors of learning, individuality, motor development, and sport and rehabilitation interventions. LA - English DB - MTMT ER - TY - JOUR AU - Valk, Tim A. AU - Mouton, Leonora J. AU - Otten, Egbert AU - Bongers, Raoul M. TI - Synergies reciprocally relate end-effector and joint-angles in rhythmic pointing movements JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 9 PY - 2019 PG - 17 SN - 2045-2322 DO - 10.1038/s41598-019-53913-9 UR - https://m2.mtmt.hu/api/publication/31564541 ID - 31564541 AB - During rhythmic pointing movements, degrees of freedom (DOF) in the human action system-such as joint-angles in the arm-are assumed to covary to stabilise end-effector movement, e.g. index finger. In this paper, it is suggested that the end-effector movement and the coordination of DOF are reciprocally related in synergies that link DOF so as to produce the end-effector movement. The coordination of DOF in synergies and the relation between end-effector movement and DOF coordination received little attention, though essential to understand the principles of synergy formation. Therefore, the current study assessed how the end-effector movement related to the coordination of joint-angles during rhythmic pointing across target widths and distances. Results demonstrated that joint-angles were linked in different synergies when end-effector movements differed across conditions. Furthermore, in every condition, three joint-angles (shoulder plane of elevation, shoulder inward-outward rotation, elbow flexion-extension) largely drove the end-effector, and all joint-angles contributed to covariation that stabilised the end-effector. Together, results demonstrated synergies that produced the end-effector movement, constrained joint-angles so that they covaried to stabilise the end-effector, and differed when end-effector movement differed. Hence, end-effector and joint-angles were reciprocally related in synergies-indicating that the action system was organised as a complex dynamical system. LA - English DB - MTMT ER - TY - JOUR AU - Cuadra, Cristian AU - Bartsch, Angelo AU - Tiemann, Paula AU - Reschechtko, Sasha AU - Latash, Mark L TI - Multi-finger synergies and the muscular apparatus of the hand JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 236 PY - 2018 IS - 5 SP - 1383 EP - 1393 PG - 11 SN - 0014-4819 DO - 10.1007/s00221-018-5231-5 UR - https://m2.mtmt.hu/api/publication/27557249 ID - 27557249 LA - English DB - MTMT ER - TY - JOUR AU - Goleni, Laura AU - Bongers, Raoul M. AU - van Hoorn, Jessika F. AU - Otten, Egbert AU - Mouton, Leonora J. AU - Schoemaker, Marina M. TI - Variability in coordination patterns in children with developmental coordination disorder (DCD) JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 60 PY - 2018 SP - 202 EP - 213 PG - 12 SN - 0167-9457 DO - 10.1016/j.humov.2018.06.009 UR - https://m2.mtmt.hu/api/publication/30457455 ID - 30457455 AB - High motor variability is an often-found characteristic of Developmental Coordination Disorder (DCD). Still, the role of high motor variability in DCD needs further examination. This study focused on variability in coordination patterns, which is essential considering that DCD is a coordination disorder. We examined variability in coordination patterns of the arm over repetitions of trials in goal-directed reaching movements. This variability was partitioned into variability that does not affect the index fingertip position (V-ucm) and variability that does affect the index fingertip position (V-ort). This study aimed to increase the understanding of motor variability in DCD by comparing V-ucm and V-ort on between children with DCD and typically developing (TD) children in a goal-directed reaching task. Twenty-two children (eleven with DCD) ages 6-11 performed 30 reaching movements. The Uncontrolled Manifold method was used to quantify V-ucm and V-ort. Results showed that children with DCD had more V-ucm than TD children while V-ort was similar between groups, showing that coordination patterns in children with DCD are more variable, but interestingly, this higher variability does not affect performance. This study indicates that high motor variability in DCD is not necessarily negative. Possible roles of motor variability in DCD are discussed. LA - English DB - MTMT ER - TY - JOUR AU - Tokuda, Kazuki AU - Anan, Masaya AU - Takahashi, Makoto AU - Sawada, Tomonori AU - Tanimoto, Kenji AU - Kito, Nobuhiro AU - Shinkoda, Koichi TI - Biomechanical mechanism of lateral trunk lean gait for knee osteoarthritis patients JF - JOURNAL OF BIOMECHANICS J2 - J BIOMECH VL - 66 PY - 2018 SP - 10 EP - 17 PG - 8 SN - 0021-9290 DO - 10.1016/j.jbiomech.2017.10.016 UR - https://m2.mtmt.hu/api/publication/27306027 ID - 27306027 LA - English DB - MTMT ER - TY - JOUR AU - Dai, Yong AU - Wu, Junbin AU - Ji, Junhong AU - Jia, Qi TI - A Trajectory Measuring Method of Multi-Fingers Based on Image Processing JF - FRONTIERS IN ARTIFICIAL INTELLIGENCE AND APPLICATIONS J2 - FRONT ARTIF INTELL APPL VL - 299 PY - 2017 SP - 221 EP - 230 PG - 10 SN - 0922-6389 DO - 10.3233/978-1-61499-828-0-221 UR - https://m2.mtmt.hu/api/publication/27557250 ID - 27557250 LA - English DB - MTMT ER - TY - JOUR AU - Fridland, Ellen TI - Automatically minded JF - SYNTHESE J2 - SYNTHESE VL - 194 PY - 2017 IS - 11 SP - 4337 EP - 4363 PG - 27 SN - 0039-7857 DO - 10.1007/s11229-014-0617-9 UR - https://m2.mtmt.hu/api/publication/27074466 ID - 27074466 LA - English DB - MTMT ER - TY - JOUR AU - Fridland, Ellen TI - Skill and motor control: intelligence all the way down JF - PHILOSOPHICAL STUDIES-DORDRECHT J2 - PHILOS STUD VL - 174 PY - 2017 IS - 6 SP - 1539 EP - 1560 PG - 22 SN - 0031-8116 DO - 10.1007/s11098-016-0771-7 UR - https://m2.mtmt.hu/api/publication/26743011 ID - 26743011 LA - English DB - MTMT ER - TY - JOUR AU - Krueger, Melanie AU - Straube, Andreas AU - Eggert, Thomas TI - The Propagation of Movement Variability in Time: A Methodological Approach for Discrete Movements with Multiple Degrees of Freedom JF - FRONTIERS IN COMPUTATIONAL NEUROSCIENCE J2 - FRONT COMPUT NEUROSC VL - 11 PY - 2017 PG - 11 SN - 1662-5188 DO - 10.3389/fncom.2017.00093 UR - https://m2.mtmt.hu/api/publication/27074467 ID - 27074467 LA - English DB - MTMT ER - TY - JOUR AU - Sandlund, J AU - Srinivasan, D AU - Heiden, M AU - Mathiassen, SE TI - Differences in motor variability among individuals performing a standardized short-cycle manual task JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 51 PY - 2017 SP - 17 EP - 26 PG - 10 SN - 0167-9457 DO - 10.1016/j.humov.2016.10.009 UR - https://m2.mtmt.hu/api/publication/26177377 ID - 26177377 LA - English DB - MTMT ER - TY - JOUR AU - Suberi, N A Mohammed AU - Razman, R AU - Callow, N TI - Does Imagery Facilitate a Reduction in Movement Variability in a Targeting Task? JF - IFMBE PROCEEDINGS J2 - IFMBE PROC VL - 58 PY - 2017 IS - Malacca SP - 148 EP - 151 PG - 4 SN - 1680-0737 DO - 10.1007/978-981-10-3737-5_31 UR - https://m2.mtmt.hu/api/publication/27074468 ID - 27074468 LA - English DB - MTMT ER - TY - JOUR AU - Tuitert, Inge AU - Bootsma, Reinoud J AU - Schoemaker, Marina M AU - Otten, Egbert AU - Mouton, Leonora J AU - Bongers, Raoul M TI - Does practicing a wide range of joint angle configurations lead to higher flexibility in a manual obstacle-avoidance target-pointing task? JF - PLOS ONE J2 - PLOS ONE VL - 12 PY - 2017 IS - 7 PG - 16 SN - 1932-6203 DO - 10.1371/journal.pone.0181041 UR - https://m2.mtmt.hu/api/publication/26912857 ID - 26912857 LA - English DB - MTMT ER - TY - JOUR AU - John, J AU - Dingwell, JB AU - Cusumano, JP TI - Error Correction and the Structure of Inter-Trial Fluctuations in a Redundant Movement Task JF - PLOS COMPUTATIONAL BIOLOGY J2 - PLOS COMPUT BIOL VL - 12 PY - 2016 IS - 9 SN - 1553-734X DO - 10.1371/journal.pcbi.1005118 UR - https://m2.mtmt.hu/api/publication/26120314 ID - 26120314 LA - English DB - MTMT ER - TY - JOUR AU - Laczkó, József AU - Percze-Mravcsik, Mariann AU - Katona, Péter TI - Control of cycling limb movements: Aspects for rehabilitation JF - ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY J2 - ADV EXP MED BIOL VL - 957 PY - 2016 SP - 273 EP - 289 PG - 17 SN - 0065-2598 DO - 10.1007/978-3-319-47313-0_15 UR - https://m2.mtmt.hu/api/publication/32035499 ID - 32035499 LA - English DB - MTMT ER - TY - JOUR AU - Morrison, A AU - McGrath, D AU - Wallace, ES TI - Motor abundance and control structure in the golf swing JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 46 PY - 2016 SP - 129 EP - 147 PG - 19 SN - 0167-9457 DO - 10.1016/j.humov.2016.01.009 UR - https://m2.mtmt.hu/api/publication/25637434 ID - 25637434 LA - English DB - MTMT ER - TY - JOUR AU - Togo, S AU - Kagawa, T AU - Uno, Y TI - Changes in motor synergies for tracking movement and responses to perturbations depend on task-irrelevant dimension constraints JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 46 PY - 2016 SP - 104 EP - 116 PG - 13 SN - 0167-9457 DO - 10.1016/j.humov.2015.12.010 UR - https://m2.mtmt.hu/api/publication/25637435 ID - 25637435 LA - English DB - MTMT ER - TY - JOUR AU - Togo, S AU - Kagawa, T AU - Uno, Y TI - Uncontrolled Manifold Reference Feedback Control of Multi-Joint Robot Arms JF - FRONTIERS IN COMPUTATIONAL NEUROSCIENCE J2 - FRONT COMPUT NEUROSC VL - 10 PY - 2016 PG - 18 SN - 1662-5188 DO - 10.3389/fncom.2016.00069 UR - https://m2.mtmt.hu/api/publication/25979506 ID - 25979506 LA - English DB - MTMT ER - TY - JOUR AU - Valk, Tim A AU - Mouton, Leonora J AU - Bongers, Raoul M TI - Joint-Angle Coordination Patterns Ensure Stabilization of a Body-Plus-Tool System in Point-to-Point Movements with a Rod JF - FRONTIERS IN PSYCHOLOGY J2 - FRONT PSYCHOL VL - 7 PY - 2016 PG - 12 SN - 1664-1078 DO - 10.3389/fpsyg.2016.00826 UR - https://m2.mtmt.hu/api/publication/26022670 ID - 26022670 LA - English DB - MTMT ER - TY - JOUR AU - Cashaback, Joshua G A AU - McGregor, Heather R AU - Gribble, Paul L TI - The human motor system alters its reaching movement plan for task-irrelevant, positional forces JF - JOURNAL OF NEUROPHYSIOLOGY J2 - J NEUROPHYSIOL VL - 113 PY - 2015 IS - 7 SP - 2137 EP - 2149 PG - 13 SN - 0022-3077 DO - 10.1152/jn.00901.2014 UR - https://m2.mtmt.hu/api/publication/25334477 ID - 25334477 LA - English DB - MTMT ER - TY - JOUR AU - Papi, Enrica AU - Rowe, Philip J AU - Pomeroy, Valerie M TI - Analysis of gait within the uncontrolled manifold hypothesis: Stabilisation of the centre of mass during gait JF - JOURNAL OF BIOMECHANICS J2 - J BIOMECH VL - 48 PY - 2015 IS - 2 SP - 324 EP - 331 PG - 8 SN - 0021-9290 DO - 10.1016/j.jbiomech.2014.11.024 UR - https://m2.mtmt.hu/api/publication/24791732 ID - 24791732 LA - English DB - MTMT ER - TY - JOUR AU - Romero, Veronica AU - Kallen, Rachel AU - Riley, Michael A AU - Richardson, Michael J TI - Can Discrete Joint Action Be Synergistic? Studying the Stabilization of Interpersonal Hand Coordination JF - JOURNAL OF EXPERIMENTAL PSYCHOLOGY-HUMAN PERCEPTION AND PERFORMANCE J2 - J EXP PSYCHOL HUMAN VL - 41 PY - 2015 IS - 5 SP - 1223 EP - 1235 PG - 13 SN - 0096-1523 DO - 10.1037/xhp0000083 UR - https://m2.mtmt.hu/api/publication/25334479 ID - 25334479 LA - English DB - MTMT ER - TY - JOUR AU - Selgrade, Brian P AU - Chang, Young-Hui TI - Locomotor control of limb force switches from minimal intervention principle in early adaptation to noise reduction in late adaptation JF - JOURNAL OF NEUROPHYSIOLOGY J2 - J NEUROPHYSIOL VL - 113 PY - 2015 IS - 5 SP - 1451 EP - 1461 PG - 11 SN - 0022-3077 DO - 10.1152/jn.00246.2014 UR - https://m2.mtmt.hu/api/publication/24791730 ID - 24791730 LA - English DB - MTMT ER - TY - JOUR AU - Togo, Shunta AU - Imamizu, Hiroshi TI - Normalized Index of Synergy for Evaluating the Coordination of Motor Commands JF - PLOS ONE J2 - PLOS ONE VL - 10 PY - 2015 IS - 10 PG - 23 SN - 1932-6203 DO - 10.1371/journal.pone.0140836 UR - https://m2.mtmt.hu/api/publication/25334478 ID - 25334478 LA - English DB - MTMT ER - TY - JOUR AU - Zhou, T AU - Zhang, L AU - Latash, M L TI - INTENTIONAL AND UNINTENTIONAL MULTI-JOINT MOVEMENTS: THEIR NATURE AND STRUCTURE OF VARIANCE JF - NEUROSCIENCE J2 - NEUROSCIENCE VL - 289 PY - 2015 SP - 181 EP - 193 PG - 13 SN - 0306-4522 DO - 10.1016/j.neuroscience.2014.12.079 UR - https://m2.mtmt.hu/api/publication/24791731 ID - 24791731 LA - English DB - MTMT ER - TY - JOUR AU - Borbély, Bence József AU - Straube, A AU - Eggert, T TI - Motor synergies during manual tracking differ between familiar and unfamiliar trajectories JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 232 PY - 2014 IS - 3 SP - 889 EP - 901 PG - 13 SN - 0014-4819 DO - 10.1007/s00221-013-3801-0 UR - https://m2.mtmt.hu/api/publication/2743792 ID - 2743792 AB - Synergistic control of the effector space allows high precision in task-relevant degrees of freedom, while noise is limited to task-irrelevant degrees of freedom. The present study investigates whether this typical structure of the variance-covariance matrix of the joint angles during manual tracking differs between familiar and unfamiliar trajectories. Subjects tracked a target moving in 2D on a graphics tablet with a hand-held pen, while their arm movements were not restricted. Subjects familiarized themselves with one target trajectory during an initial training block with 40 periodic trials. In the following test block, this familiar trajectory and several unfamiliar trajectories were presented in a mixed-block design to study prediction effects at the level of endpoint and joint trajectories. The differences in the synergistic control of arm movements were analyzed using the "uncontrolled manifold method." The results showed smaller variances and weaker motor synergies during tracking of familiar trajectories than during tracking of unfamiliar trajectories. The decrease in the synergy index was due to a stronger decrease in the variance irrelevant than of the variance relevant for pen position. In the context of motor control theory, these results suggest that tracking movements on familiar and unfamiliar target trajectories do not only differ in the available knowledge about target location but also apply different strategies to control the effector space. © 2013 Springer-Verlag Berlin Heidelberg. LA - English DB - MTMT ER - TY - JOUR AU - Katona, Péter AU - Pilissy, Tamás AU - Tihanyi, Attila AU - Laczkó, József TI - The combined effect of cycling cadence and crank resistance on hamstrings and quadriceps muscle activities during cycling JF - ACTA PHYSIOLOGICA HUNGARICA J2 - ACTA PHYSIOL HUNG VL - 101 PY - 2014 IS - 4 SP - 505 EP - 516 PG - 12 SN - 0231-424X DO - 10.1556/APhysiol.101.2014.4.12 UR - https://m2.mtmt.hu/api/publication/2770129 ID - 2770129 LA - English DB - MTMT ER - TY - JOUR AU - Kruger, M AU - Eggert, T AU - Straube, A TI - Erratum for the article by Kruger et al. in MC 17(3). Age-Related Differences in the Stabilization of Important Task Variables in Reaching Movements TS - Age-Related Differences in the Stabilization of Important Task Variables in Reaching Movements JF - MOTOR CONTROL J2 - MOTOR CONTROL VL - 18 PY - 2014 IS - 1 SP - 102 PG - 1 SN - 1087-1640 DO - 10.1123/mc.2014-0005 UR - https://m2.mtmt.hu/api/publication/25637533 ID - 25637533 LA - English DB - MTMT ER - TY - JOUR AU - Nisky, Ilana AU - Hsieh, Michael H AU - Okamura, Allison M TI - Uncontrolled Manifold Analysis of Arm Joint Angle Variability During Robotic Teleoperation and Freehand Movement of Surgeons and Novices JF - IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING J2 - IEEE T BIO-MED ENG VL - 61 PY - 2014 IS - 12 SP - 2869 EP - 2881 PG - 13 SN - 0018-9294 DO - 10.1109/TBME.2014.2332359 UR - https://m2.mtmt.hu/api/publication/24791734 ID - 24791734 LA - English DB - MTMT ER - TY - JOUR AU - Parry, Ross AU - Dietrich, Gilles AU - Bril, Blandine TI - Tool use ability depends on understanding of functional dynamics and not specific joint contribution profiles JF - FRONTIERS IN PSYCHOLOGY J2 - FRONT PSYCHOL VL - 5 PY - 2014 PG - 15 SN - 1664-1078 DO - 10.3389/fpsyg.2014.00306 UR - https://m2.mtmt.hu/api/publication/24791735 ID - 24791735 LA - English DB - MTMT ER - TY - JOUR AU - Rosenblatt, NJ AU - Hurt, CP AU - Latash, ML AU - Grabiner, MD TI - An apparent contradiction: Increasing variability to achieve greater precision? JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 232 PY - 2014 IS - 2 SP - 403 EP - 413 PG - 11 SN - 0014-4819 DO - 10.1007/s00221-013-3748-1 UR - https://m2.mtmt.hu/api/publication/23709542 ID - 23709542 LA - English DB - MTMT ER - TY - JOUR AU - Wu, Y-H AU - Latash, ML TI - The effects of practice on coordination JF - EXERCISE AND SPORT SCIENCES REVIEWS J2 - EXERC SPORT SCI REV VL - 42 PY - 2014 IS - 1 SP - 37 EP - 42 PG - 6 SN - 0091-6331 DO - 10.1249/JES.0000000000000002 UR - https://m2.mtmt.hu/api/publication/23626078 ID - 23626078 LA - English DB - MTMT ER - TY - JOUR AU - Zhou, Tao AU - Solnik, Stanislaw AU - Wu, Yen-Hsun AU - Latash, Mark L TI - Unintentional movements produced by back-coupling between the actual and referent body configurations: violations of equifinality in multi-joint positional tasks JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 232 PY - 2014 IS - 12 SP - 3847 EP - 3859 PG - 13 SN - 0014-4819 DO - 10.1007/s00221-014-4059-x UR - https://m2.mtmt.hu/api/publication/24791733 ID - 24791733 LA - English DB - MTMT ER - TY - JOUR AU - Karniel, A TI - The minimum transition hypothesis for intermittent hierarchical motor control JF - FRONTIERS IN COMPUTATIONAL NEUROSCIENCE J2 - FRONT COMPUT NEUROSC VL - 7 PY - 2013 IS - 2 PG - 8 SN - 1662-5188 DO - 10.3389/fncom.2013.00012 UR - https://m2.mtmt.hu/api/publication/23626081 ID - 23626081 LA - English DB - MTMT ER - TY - JOUR AU - Krishnan, V AU - Rosenblatt, NJ AU - Latash, ML AU - Grabiner, MD TI - The effects of age on stabilization of the mediolateral trajectory of the swing foot JF - GAIT & POSTURE J2 - GAIT POSTURE VL - 38 PY - 2013 IS - 4 SP - 923 EP - 928 PG - 6 SN - 0966-6362 DO - 10.1016/j.gaitpost.2013.04.023 UR - https://m2.mtmt.hu/api/publication/23626084 ID - 23626084 LA - English DB - MTMT ER - TY - JOUR AU - Krüger, M AU - Eggert, T AU - Straube, A TI - Age-related differences in the stabilization of important task variables in reaching movements JF - MOTOR CONTROL J2 - MOTOR CONTROL VL - 17 PY - 2013 IS - 3 SP - 313 EP - 319 PG - 7 SN - 1087-1640 UR - https://m2.mtmt.hu/api/publication/23626094 ID - 23626094 LA - English DB - MTMT ER - TY - JOUR AU - Masumoto, J AU - Inui, N TI - Effects of movement duration on error compensation in periodic bimanual isometric force production JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 227 PY - 2013 IS - 4 SP - 447 EP - 455 PG - 9 SN - 0014-4819 DO - 10.1007/s00221-013-3520-6 UR - https://m2.mtmt.hu/api/publication/23626088 ID - 23626088 LA - English DB - MTMT ER - TY - JOUR AU - Mattos, D AU - Kuhl, J AU - Scholz, JP AU - Latash, ML TI - Motor equivalence (ME) during reaching: Is ME observable at the muscle level? JF - MOTOR CONTROL J2 - MOTOR CONTROL VL - 17 PY - 2013 IS - 2 SP - 145 EP - 175 PG - 31 SN - 1087-1640 DO - 10.1123/mcj.17.2.145 UR - https://m2.mtmt.hu/api/publication/23626086 ID - 23626086 LA - English DB - MTMT ER - TY - JOUR AU - Rein, R AU - Bril, B AU - Nonaka, T TI - Coordination strategies used in stone knapping JF - AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY J2 - AM J PHYS ANTHROPOL VL - 150 PY - 2013 IS - 4 SP - 539 EP - 550 PG - 12 SN - 0002-9483 DO - 10.1002/ajpa.22224 UR - https://m2.mtmt.hu/api/publication/23626091 ID - 23626091 LA - English DB - MTMT ER - TY - JOUR AU - Sarabon, N AU - Markovic, G AU - Mikulic, P AU - Latash, ML TI - Bilateral synergies in foot force production tasks JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 227 PY - 2013 IS - 1 SP - 121 EP - 130 PG - 10 SN - 0014-4819 DO - 10.1007/s00221-013-3494-4 UR - https://m2.mtmt.hu/api/publication/23626092 ID - 23626092 LA - English DB - MTMT ER - TY - JOUR AU - Wu, Y-H AU - Pazin, N AU - Zatsiorsky, VM AU - Latash, ML TI - Improving finger coordination in young and elderly persons JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 226 PY - 2013 IS - 2 SP - 273 EP - 283 PG - 11 SN - 0014-4819 DO - 10.1007/s00221-013-3433-4 UR - https://m2.mtmt.hu/api/publication/23626087 ID - 23626087 LA - English DB - MTMT ER - TY - JOUR AU - Xu, X AU - Qin, J AU - Catena, RD AU - Faber, GS AU - Lin, J-H TI - Effect of aging on inter-joint synergies during machine-paced assembly tasks JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 231 PY - 2013 IS - 2 SP - 249 EP - 256 PG - 8 SN - 0014-4819 DO - 10.1007/s00221-013-3688-9 UR - https://m2.mtmt.hu/api/publication/23626090 ID - 23626090 LA - English DB - MTMT ER - TY - JOUR AU - Casadio, M AU - Ranganathan, R AU - Mussa-Ivaldi, FA TI - The body-machine interface: A new perspective on an old theme JF - JOURNAL OF MOTOR BEHAVIOR J2 - J MOTOR BEHAV VL - 44 PY - 2012 IS - 6 SP - 419 EP - 433 PG - 15 SN - 0022-2895 DO - 10.1080/00222895.2012.700968 UR - https://m2.mtmt.hu/api/publication/23626096 ID - 23626096 LA - English DB - MTMT ER - TY - JOUR AU - Cluff, T AU - Manos, A AU - Lee, TD AU - Balasubramaniam, R TI - Multijoint error compensation mediates unstable object control JF - JOURNAL OF NEUROPHYSIOLOGY J2 - J NEUROPHYSIOL VL - 108 PY - 2012 IS - 4 SP - 1167 EP - 1175 PG - 9 SN - 0022-3077 DO - 10.1152/jn.00691.2011 UR - https://m2.mtmt.hu/api/publication/23626098 ID - 23626098 LA - English DB - MTMT ER - TY - JOUR AU - Decker, LM AU - Cignetti, F AU - Potter, JF AU - Studenski, SA AU - Stergiou, N TI - Use of motor abundance in young and older adults during dual-task treadmill walking JF - PLOS ONE J2 - PLOS ONE VL - 7 PY - 2012 IS - 7 SN - 1932-6203 DO - 10.1371/journal.pone.0041306 UR - https://m2.mtmt.hu/api/publication/23626095 ID - 23626095 LA - English DB - MTMT ER - TY - JOUR AU - Krüger, Melanie AU - Borbély, Bence József AU - Eggert, Thomas AU - Straube, Andreas TI - Synergistic control of joint angle variability: Influence of target shape JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 31 PY - 2012 IS - 5 SP - 1071 EP - 1089 PG - 19 SN - 0167-9457 DO - 10.1016/j.humov.2011.12.002 UR - https://m2.mtmt.hu/api/publication/1959967 ID - 1959967 AB - Reaching movements are often used to study the effectiveness of motor control processes with respect to the final position of arm and hand. Empirical evidence shows that different targets can be grasped with similar final position accuracy. However, movements that achieve similar accuracy at their final position may nevertheless be controlled differently. In particular, control strategies may differ in the control of the abundant degrees of freedom with respect to the task-specific costs. The objective of the present study was to investigate whether the applied control strategy was influenced by the shape of the target to be grasped. It was investigated whether mechanical constraints, imposed on final hand orientation or final hand position by the shape of the targets, affected the synergistic coordination of the kinematic degrees of freedom of the arm. Subjects were asked to grasp either a cylindrical or a spherical target, which imposed different constraints on final hand orientation and position. Besides temporal movement aspects, variability of the joint angles of the arm, as well as variability of hand orientation and hand position was analyzed over the whole time course of movement execution, using the uncontrolled manifold method. Overall movement duration differed between cylindrical and spherical target condition, due to differences in deceleration duration. Reaching movements towards the cylindrical target, which was more constraint in final hand orientation and position, took longer than movements towards the spherical target. Analysis further revealed that the degrees of freedom of the arm were synergistically coordinated to stabilize both hand orientation and hand position, when grasping either the spherical or the cylindrical target. This suggests that the applied control strategy in natural reaching movements can simultaneously account for multiple task constraints. The analysis further revealed that stabilization of hand orientation was stronger when reaching towards a cylindrical target, which imposed more constraints on final hand orientation. In contrast, hand position was more strongly stabilized in the spherical target shape condition, where stronger constraints on final hand position were applied. This suggests that different target shapes do influence the control strategy of reaching movements even though variability at movement end was not affected. LA - English DB - MTMT ER - TY - BOOK AU - Latash, ML TI - Fundamentals of Motor Control PB - Elsevier Inc. CY - New York, New York PY - 2012 SP - 352 SN - 9780124159563 UR - https://m2.mtmt.hu/api/publication/23626102 ID - 23626102 LA - English DB - MTMT ER - TY - JOUR AU - Latash, ML TI - Movements that are both variable and optimal JF - JOURNAL OF HUMAN KINETICS J2 - J HUM KINET VL - 34 PY - 2012 IS - 1 SP - 5 EP - 13 PG - 9 SN - 1640-5544 DO - 10.2478/v10078-012-0058-9 UR - https://m2.mtmt.hu/api/publication/23626100 ID - 23626100 LA - English DB - MTMT ER - TY - JOUR AU - Nazarpour, K AU - Barnard, A AU - Jackson, A TI - Flexible cortical control of task-specific muscle synergies JF - JOURNAL OF NEUROSCIENCE J2 - J NEUROSCI VL - 32 PY - 2012 IS - 36 SP - 12349 EP - 12360 PG - 12 SN - 0270-6474 DO - 10.1523/JNEUROSCI.5481-11.2012 UR - https://m2.mtmt.hu/api/publication/23626103 ID - 23626103 LA - English DB - MTMT ER - TY - JOUR AU - Nonaka, T AU - Bril, B TI - Nesting of asymmetric functions in skilled bimanual action: Dynamics of hammering behavior of bead craftsmen JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 31 PY - 2012 IS - 1 SP - 55 EP - 77 PG - 23 SN - 0167-9457 DO - 10.1016/j.humov.2010.08.013 UR - https://m2.mtmt.hu/api/publication/22055938 ID - 22055938 LA - English DB - MTMT ER - TY - JOUR AU - Srinivasan, D AU - Mathiassen, SE TI - Motor variability in occupational health and performance JF - CLINICAL BIOMECHANICS J2 - CLIN BIOMECH VL - 27 PY - 2012 IS - 10 SP - 979 EP - 993 PG - 15 SN - 0268-0033 DO - 10.1016/j.clinbiomech.2012.08.007 UR - https://m2.mtmt.hu/api/publication/23626101 ID - 23626101 LA - English DB - MTMT ER - TY - JOUR AU - Togo, S AU - Kagawa, T AU - Uno, Y TI - Motor synergies for dampening hand vibration during human walking JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 216 PY - 2012 IS - 1 SP - 81 EP - 90 PG - 10 SN - 0014-4819 DO - 10.1007/s00221-011-2909-3 UR - https://m2.mtmt.hu/api/publication/21959870 ID - 21959870 LA - English DB - MTMT ER - TY - JOUR AU - Vernooij, C A AU - Mouton, L J AU - Bongers, R M TI - Learning to control orientation and force in a hammering task: The initial stage JF - ZEITSCHRIFT FÜR PSYCHOLOGIE J2 - Z PSYCHOL VL - 220 PY - 2012 IS - 1 SP - 29 EP - 36 PG - 8 SN - 2190-8370 DO - 10.1027/2151-2604/a000088 UR - https://m2.mtmt.hu/api/publication/21968410 ID - 21968410 LA - English DB - MTMT ER - TY - JOUR AU - Wu, Y-H AU - Pazin, N AU - Zatsiorsky, VM AU - Latash, ML TI - Practicing elements versus practicing coordination: Changes in the structure of variance JF - JOURNAL OF MOTOR BEHAVIOR J2 - J MOTOR BEHAV VL - 44 PY - 2012 IS - 6 SP - 471 EP - 478 PG - 8 SN - 0022-2895 DO - 10.1080/00222895.2012.740101 UR - https://m2.mtmt.hu/api/publication/23626097 ID - 23626097 LA - English DB - MTMT ER - TY - JOUR AU - Hu, XG AU - Newell, KM TI - Modeling constraints to redundancy in bimanual force coordination JF - JOURNAL OF NEUROPHYSIOLOGY J2 - J NEUROPHYSIOL VL - 105 PY - 2011 IS - 5 SP - 2169 EP - 2180 PG - 12 SN - 0022-3077 DO - 10.1152/jn.01086.2010 UR - https://m2.mtmt.hu/api/publication/21959872 ID - 21959872 LA - English DB - MTMT ER - TY - THES AU - Hu, Xiaogang TI - CONSTRAINTS, REDUNDANCY, AND PATTERNS OF FORCE COORDINATION PY - 2011 SP - 128 UR - https://m2.mtmt.hu/api/publication/22250594 ID - 22250594 LA - English DB - MTMT ER - TY - JOUR AU - Knill, DC AU - Bondada, A AU - Chhabra, M TI - Flexible, Task-Dependent Use of Sensory Feedback to Control Hand Movements JF - JOURNAL OF NEUROSCIENCE J2 - J NEUROSCI VL - 31 PY - 2011 IS - 4 SP - 1219 EP - 1237 PG - 19 SN - 0270-6474 DO - 10.1523/JNEUROSCI.3522-09.2011 UR - https://m2.mtmt.hu/api/publication/21959875 ID - 21959875 LA - English DB - MTMT ER - TY - CHAP AU - Latash, ML TI - Anticipatory Control of Voluntary Action: Merging the Ideas of Equilibrium-point Control and Synergic Control T2 - Motor Control: Theories, Experiments, and Applications PB - Oxford University Press SN - 9780199863518 PB - Oxford University Press PY - 2011 SP - 3 EP - 29 PG - 27 DO - 10.1093/acprof:oso/9780195395273.003.0001 UR - https://m2.mtmt.hu/api/publication/24455464 ID - 24455464 LA - English DB - MTMT ER - TY - JOUR AU - Stergiou, N AU - Decker, LM TI - Human movement variability, nonlinear dynamics, and pathology: Is there a connection? JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 30 PY - 2011 IS - 5 SP - 869 EP - 888 PG - 20 SN - 0167-9457 DO - 10.1016/j.humov.2011.06.002 UR - https://m2.mtmt.hu/api/publication/21959874 ID - 21959874 LA - English DB - MTMT ER - TY - CHAP AU - Tibold, Róbert AU - Laczkó, József ED - Simone, Frattasi TI - The effect of load on variances of object replacing arm movements T2 - Proceedings of the 4th International Symposium on Applied Sciences in Biomedical and Communication Technologies, ISABEL'11 PB - Association for Computing Machinery (ACM) CY - New York, New York SN - 1450309135 T3 - ACM international conference proceeding PY - 2011 PG - 3 DO - 10.1145/2093698.2093882 UR - https://m2.mtmt.hu/api/publication/3333112 ID - 3333112 LA - English DB - MTMT ER - TY - JOUR AU - Tibold, Róbert AU - Fazekas, Gábor AU - Laczkó, József TI - Three-Dimensional Model to Predict Muscle Forces and Their Relation to Motor Variances in Reaching Arm Movements JF - JOURNAL OF APPLIED BIOMECHANICS J2 - J APPL BIOMECH VL - 27 PY - 2011 IS - 4 SP - 362 EP - 374 PG - 13 SN - 1065-8483 DO - 10.1123/jab.27.4.362 UR - https://m2.mtmt.hu/api/publication/1854515 ID - 1854515 AB - A three-dimensional (3-D) arm movement model is presented to simulate kinematic properties and muscle forces in reaching arm movements. Healthy subjects performed reaching movements repetitively either with or without a load in the hand. Joint coordinates were measured. Muscle moment arms, 3-D angular acceleration, and moment of inertias of arm segments were calculated to determine 3-D joint torques. Variances of hand position, arm configuration, and muscle activities were calculated. Ratios of movement variances observed in the two conditions (load versus without load) showed no differences for hand position and arm configuration variances. Virtual muscle force variances for all muscles except deltoid posterior and EMG variances for four muscles increased significantly by moving with the load. The greatly increased variances in muscle activity did not imply equally high increments in kinematic variances. We conclude that enhanced muscle cooperation through synergies helps to stabilize movement at the kinematic level when a load is added. LA - English DB - MTMT ER - TY - JOUR AU - van der Steen, MC AU - Bongers, RM TI - Joint angle variability and co-variation in a reaching with a rod task JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 208 PY - 2011 IS - 3 SP - 411 EP - 422 PG - 12 SN - 0014-4819 DO - 10.1007/s00221-010-2493-y UR - https://m2.mtmt.hu/api/publication/21959873 ID - 21959873 LA - English DB - MTMT ER - TY - JOUR AU - Degani, AM AU - Danna-Dos-Santos, A AU - Robert, T AU - Latash, ML TI - Kinematic synergies during saccades involving whole-body rotation: A study based on the uncontrolled manifold hypothesis JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 29 PY - 2010 IS - 2 SP - 243 EP - 258 PG - 16 SN - 0167-9457 DO - 10.1016/j.humov.2010.02.003 UR - https://m2.mtmt.hu/api/publication/21959880 ID - 21959880 LA - English DB - MTMT ER - TY - JOUR AU - Diedrichsen, Joern AU - Shadmehr, Reza AU - Ivry, Richard B TI - The coordination of movement: optimal feedback control and beyond JF - TRENDS IN COGNITIVE SCIENCES J2 - TRENDS COGN SCI VL - 14 PY - 2010 IS - 1 SP - 31 EP - 39 PG - 9 SN - 1364-6613 DO - 10.1016/j.tics.2009.11.004 UR - https://m2.mtmt.hu/api/publication/25699621 ID - 25699621 LA - English DB - MTMT ER - TY - THES AU - JACQUIER-BRET, Julien TI - Analyse biomécanique du mouvement de préhension contraint et altéré. indices quantitatifs de la gestion de la redondance motrice TS - indices quantitatifs de la gestion de la redondance motrice PY - 2010 SP - 196 UR - https://m2.mtmt.hu/api/publication/22250589 ID - 22250589 LA - English DB - MTMT ER - TY - JOUR AU - Latash, Mark L TI - Motor Synergies and the Equilibrium-Point Hypothesis JF - MOTOR CONTROL J2 - MOTOR CONTROL VL - 14 PY - 2010 IS - 3 SP - 294 EP - 322 PG - 29 SN - 1087-1640 DO - 10.1123/mcj.14.3.294 UR - https://m2.mtmt.hu/api/publication/25683615 ID - 25683615 LA - English DB - MTMT ER - TY - JOUR AU - Latash, ML TI - Stages in learning motor synergies: A view based on the equilibrium-point hypothesis JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 29 PY - 2010 IS - 5 SP - 642 EP - 654 PG - 13 SN - 0167-9457 DO - 10.1016/j.humov.2009.11.002 UR - https://m2.mtmt.hu/api/publication/21959878 ID - 21959878 LA - English DB - MTMT ER - TY - JOUR AU - Ranganathan, R AU - Newell, KM TI - Emergent flexibility in motor learning JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 202 PY - 2010 IS - 4 SP - 755 EP - 764 PG - 10 SN - 0014-4819 DO - 10.1007/s00221-010-2177-7 UR - https://m2.mtmt.hu/api/publication/21959882 ID - 21959882 LA - English DB - MTMT ER - TY - JOUR AU - Ranganathan, R AU - Newell, KM TI - Influence of motor learning on utilizing path redundancy JF - NEUROSCIENCE LETTERS J2 - NEUROSCI LETT VL - 469 PY - 2010 IS - 3 SP - 416 EP - 420 PG - 5 SN - 0304-3940 DO - 10.1016/j.neulet.2009.12.041 UR - https://m2.mtmt.hu/api/publication/21959881 ID - 21959881 LA - English DB - MTMT ER - TY - THES AU - YUNGHER, Don TI - Rehabilitation and kinesiological analysis of motor control in grasp PY - 2010 SP - 139 UR - https://m2.mtmt.hu/api/publication/22250591 ID - 22250591 LA - English DB - MTMT ER - TY - JOUR AU - Diedrichsen, J AU - Dowling, N TI - Bimanual coordination as task-dependent linear control policies JF - HUMAN MOVEMENT SCIENCE J2 - HUM MOVEMENT SCI VL - 28 PY - 2009 IS - 3 SP - 334 EP - 347 PG - 14 SN - 0167-9457 DO - 10.1016/j.humov.2008.10.003 UR - https://m2.mtmt.hu/api/publication/21959890 ID - 21959890 LA - English DB - MTMT ER - TY - JOUR AU - Diedrichsen, J AU - Gush, S TI - Reversal of Bimanual Feedback Responses With Changes in Task Goal JF - JOURNAL OF NEUROPHYSIOLOGY J2 - J NEUROPHYSIOL VL - 101 PY - 2009 IS - 1 SP - 283 EP - 288 PG - 6 SN - 0022-3077 DO - 10.1152/jn.90887.2008 UR - https://m2.mtmt.hu/api/publication/21959886 ID - 21959886 LA - English DB - MTMT ER - TY - JOUR AU - Gorniak, SL AU - Feldman, AG AU - Latash, ML TI - Joint coordination during bimanual transport of real and imaginary objects JF - NEUROSCIENCE LETTERS J2 - NEUROSCI LETT VL - 456 PY - 2009 IS - 2 SP - 80 EP - 84 PG - 5 SN - 0304-3940 DO - 10.1016/j.neulet.2009.03.084 UR - https://m2.mtmt.hu/api/publication/21959888 ID - 21959888 LA - English DB - MTMT ER - TY - JOUR AU - Jacquier-Bret, J AU - Rezzoug, N AU - Gorce, P TI - Adaptation of Joint Flexibility During a Reach-to-Grasp Movement JF - MOTOR CONTROL J2 - MOTOR CONTROL VL - 13 PY - 2009 IS - 3 SP - 342 EP - 361 PG - 20 SN - 1087-1640 DO - 10.1123/mcj.13.3.342 UR - https://m2.mtmt.hu/api/publication/21959892 ID - 21959892 LA - English DB - MTMT ER - TY - JOUR AU - Keresztenyi, Z AU - Cesari, P AU - Fazekas, Gábor AU - Laczkó, József TI - The relation of hand and arm configuration variances while tracking geometric figures in Parkinson's disease: aspects for rehabilitation JF - INTERNATIONAL JOURNAL OF REHABILITATION RESEARCH J2 - INT J REHABIL RES VL - 32 PY - 2009 IS - 1 SP - 53 EP - 63 PG - 11 SN - 0342-5282 DO - 10.1097/MRR.0b013e32830d369c UR - https://m2.mtmt.hu/api/publication/1854524 ID - 1854524 AB - Variances of drawing arm movements between patients with Parkinson's disease and healthy controls were compared. The aim was to determine whether differences in joint synergies or individual joint rotations affect the endpoint (hand position) variance. Joint and endpoint coordinates were measured while participants performed drawing tasks. Variances of arm configurations and endpoints were computed and statistically analyzed for 12 patients and 12 controls. The variance of arm movements for patients (both for arm configuration and endpoint) was overall higher than that for the control group. Variation was smaller for drawing a circle versus a square and for drawing with the dominant versus the nondominant hand within both groups. The ratio of arm configuration variances between groups was similar to the ratio of endpoint variances. There were significant differences in the velocity, but not in the path lengths of movements comparing the two groups. Patients presented less movement stability while drawing different figures in different trials. Moreover, the similarity of the ratios suggests that the ill-coordinated hand movement was caused by the error in the movements of individual body parts rather than by the lack of intersegmental coordination. Thus, rehabilitation may focus on the improvement of the precision of individual joint rotations. LA - English DB - MTMT ER - TY - BOOK AU - Latash, ML TI - Synergy PB - Oxford University Press CY - Oxford PY - 2009 SN - 9780199864195 DO - 10.1093/acprof:oso/9780195333169.001.0001 UR - https://m2.mtmt.hu/api/publication/25637442 ID - 25637442 LA - English DB - MTMT ER - TY - JOUR AU - Mutha, PK AU - Sainburg, RL TI - Shared Bimanual Tasks Elicit Bimanual Reflexes During Movement JF - JOURNAL OF NEUROPHYSIOLOGY J2 - J NEUROPHYSIOL VL - 102 PY - 2009 IS - 6 SP - 3142 EP - 3155 PG - 14 SN - 0022-3077 DO - 10.1152/jn.91335.2008 UR - https://m2.mtmt.hu/api/publication/21959885 ID - 21959885 LA - English DB - MTMT ER - TY - JOUR AU - O, Sullivan I AU - Burdet, E AU - Diedrichsen, J TI - Dissociating Variability and Effort as Determinants of Coordination JF - PLOS COMPUTATIONAL BIOLOGY J2 - PLOS COMPUT BIOL VL - 5 PY - 2009 IS - 4 SN - 1553-734X DO - 10.1371/journal.pcbi.1000345 UR - https://m2.mtmt.hu/api/publication/21959889 ID - 21959889 LA - English DB - MTMT ER - TY - THES AU - Ranganathan, Rajiv TI - Utilizing Redundancy in Motor Learning PY - 2009 SP - 127 UR - https://m2.mtmt.hu/api/publication/22251533 ID - 22251533 LA - English DB - MTMT ER - TY - JOUR AU - Robert, T AU - Bennett, BC AU - Russell, SD AU - Zirker, CA AU - Abel, MF TI - Angular momentum synergies during walking JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 197 PY - 2009 IS - 2 SP - 185 EP - 197 PG - 13 SN - 0014-4819 DO - 10.1007/s00221-009-1904-4 UR - https://m2.mtmt.hu/api/publication/21959891 ID - 21959891 LA - English DB - MTMT ER - TY - JOUR AU - Shafir, T AU - Brown, S H TI - Timing and the control of rhythmic upper-limb movements JF - JOURNAL OF MOTOR BEHAVIOR J2 - J MOTOR BEHAV VL - 42 PY - 2009 IS - 1 SP - 71 EP - 84 PG - 14 SN - 0022-2895 DO - 10.1080/00222890903397137 UR - https://m2.mtmt.hu/api/publication/21968411 ID - 21968411 LA - English DB - MTMT ER - TY - JOUR AU - Tseng, YW AU - Scholz, JP AU - Galloway, JC TI - The organization of intralimb and interlimb synergies in response to different joint dynamics JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 193 PY - 2009 IS - 2 SP - 239 EP - 254 PG - 16 SN - 0014-4819 DO - 10.1007/s00221-008-1616-1 UR - https://m2.mtmt.hu/api/publication/21959884 ID - 21959884 LA - English DB - MTMT ER - TY - JOUR AU - Yen, JT AU - Auyang, AG AU - Chang, YH TI - Joint-level kinetic redundancy is exploited to control limb-level forces during human hopping JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 196 PY - 2009 IS - 3 SP - 439 EP - 451 PG - 13 SN - 0014-4819 DO - 10.1007/s00221-009-1868-4 UR - https://m2.mtmt.hu/api/publication/21959887 ID - 21959887 LA - English DB - MTMT ER -