TY  - JOUR
AU  - Halász, Péter
TI  - K-complex, a reactive EEG graphoelement of NREM sleep: an old chap in a new garment.
JF  - SLEEP MEDICINE REVIEWS
J2  - SLEEP MED REV
VL  - 9
PY  - 2005
IS  - 5
SP  - 391
EP  - 412
PG  - 22
SN  - 1087-0792
DO  - 10.1016/j.smrv.2005.04.003
UR  - https://m2.mtmt.hu/api/publication/2318569
ID  - 2318569
AB  - This review summarises data gathered on the KC phenomenon over the past 70 yr. The following issues are discussed: definitions, morphology and topography of KC, the regular participation in NREM sleep, elicitability features of evoked KC, autonomic and motor concomitants, relationship of KC with information processing during NREM sleep, relationship of KC and deltas of NREM sleep, and relationship of KC with sleep cyclicity. KC is a complex multifunctional phenomenon of the sleeping brain involved in information processing and defence against the arousal effect of sensory stimuli. To put the old chap in a new garment, the relationship of KC with synchronisation-type and desynchronisation-type micro-arousals, and the 'cyclic alternating pattern', will be discussed, with an emphasis on the sleep-protecting role of KC and synchronisation-type answers in sleep regulation executed by phasic events. Lastly, the role of KC providing gating functions in idiopathic generalized epilepsies and other, different, sleep disorders are characterised. A 'theoretical epilogue' is appended to show some system theoretical and regulational aspects.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Ulbert, István
AU  - Halgren, E
AU  - Heit, G
AU  - Karmos, György
TI  - Multiple microelectrode-recording system for human intracortical applications.
JF  - JOURNAL OF NEUROSCIENCE METHODS
J2  - J NEUROSCI METH
VL  - 106
PY  - 2001
IS  - 1
SP  - 69
EP  - 79
PG  - 11
SN  - 0165-0270
DO  - 10.1016/S0165-0270(01)00330-2
UR  - https://m2.mtmt.hu/api/publication/1121140
ID  - 1121140
AB  - The human brain is dominated by the neocortex, a large folded surface, whose
cellular and synaptic elements are arranged in layers. Since cortical structure
is relatively constant across its surface, local information processing can be
inferred from multiple laminar recordings of its electrical activity along a line
perpendicular to its surface. Such recordings need to be spaced at least as close
together as the cortical layers, and need to be wideband in order to sample both 
low frequency synaptic currents as well as high-frequency action potentials.
Finally, any device used in the human brain must comply with strict safety
standards. The current paper presents details of a system meeting these criteria,
together with sample results obtained from epileptic subjects undergoing acute or
chronic intracranial monitoring for definition of the epileptogenic region.
LA  - English
DB  - MTMT
ER  -