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Titolo:
The N550 component of the evoked K-complex: A modality non-specific response?
Autore:
Colrain, IM; Webster, KE; Hirst, G;
Indirizzi:
Univ Melbourne, Dept Psychol, Parkville, Vic 3052, Australia Univ Melbourne Parkville Vic Australia 3052 arkville, Vic 3052, Australia
Titolo Testata:
JOURNAL OF SLEEP RESEARCH
fascicolo: 4, volume: 8, anno: 1999,
pagine: 273 - 280
SICI:
0962-1105(199912)8:4<273:TNCOTE>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVENT-RELATED POTENTIALS; NREM SLEEP;
Keywords:
auditory evoked potential; K-complex; N550; respiratory-related evoked potential; sleep;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Colrain, IM Univ Melbourne, Dept Psychol, Parkville, Vic 3052, Australia Univ Melbourne Parkville Vic Australia 3052 c 3052, Australia
Citazione:
I.M. Colrain et al., "The N550 component of the evoked K-complex: A modality non-specific response?", J SLEEP RES, 8(4), 1999, pp. 273-280

Abstract

A large amplitude late negative deflection peaking between 500 and 650 ms is observable in the averaged K-complex wave-form. This peak is thus often labelled the N550. 'N550' appears during stage 2 and is maintained into slow wave sleep but is not apparent during REM. Most studies have employed auditory stimuli to elicit the K-complex. Two experiments were run to examine the effects of stimulus modality on the topographical distribution of the N550. In the first experiment, the K-complexes were elicited in an auditory oddball procedure. In the second experiment, K-complexes were elicited by respiratory occlusions. Twenty-nine channel recordings were used to increasespatial resolution. N550 was substantially larger in the average of trialscontaining K-complexes than in trials in which a K-complex could not be identified. N550 varied inversely in amplitude with the probability of accordance of the stimulus. The topographic distribution of the N550 was consistent between experiments. It was bilaterally symmetrical and was maximal overfronto-central regions of the scalp. The results indicate that the N550 reflects the activity of a modality non-specific, sleep dependent generator that responds to both interoceptive and external stimulation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 19:11:24