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| Research article summary (published 30 Dec 2001): |
Changes in the scalp topography of event-related potentials and behavioral responses during the sleep onset period.
Full Abstract
Event-related potentials (ERPs) and behavioral responsiveness were investigated during the transition from wakefulness to sleep. Ten participants were presented with an auditory oddball task during repeated sleep onset periods. The EEG was recorded from 29 different scalp sites. A 1500-Hz tone pip was presented infrequently (p = .04) within a series of lower pitch 1000-Hz "standard" stimuli (p = .96). Participants were required to button press upon detection of the rare "target" stimulus. During wakefulness, almost all targets were detected. A large amplitude P300 was observed to these detected targets. This P300 was maximum over parietal areas of the scalp. During stage 1 sleep, subjects continued to respond on 47% of trials. The parietal P300 amplitude remained large to these detected targets. It was, however, much attenuated at frontal sites. When the participant failed to detect the target in either stage 1 or 2, no P300 was visible. P300 is thus associated with behavioral detection of the target stimulus, whether in wakefulness or stage 1 "sleep." Trials were also sorted by reaction time (RT), in which bins 1-3 represented increasingly long RT. In the waking state, P300 amplitude did not significantly vary across the different bins. Although mean RT latency varied by 512 ms from bin 1 to bin 3, P300 latency varied by only 25 ms. Differences in RT are thus probably due to response-related processes rather than stimulus classification time.
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Author information
Author/s: Cote, Kimberly A (KA); De Lugt, Duncan R (DR); Campbell, Kenneth B (KB);
Affiliation: School of Psychology, University of Ottawa, Ontario, Canada. kcote(-atsign-)cogito.psyc.brocku.ca
Journal and publication information
Publication Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.
Journal: Psychophysiology (Psychophysiology), published in United States. (Language: eng)
Reference: 2002-Jan; vol 39 (issue 1) : pp 29-37
Dates: Created 2002/09/02; Completed 2002/10/02; Revised 2006/11/15;
PMID: 12206293, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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