Document Detail


Anticipation of natural stimuli modulates EEG dynamics: physiology and simulation.
MedLine Citation:
PMID:  19003476     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
In everyday life we often encounter situations in which we can expect a visual stimulus before we actually see it. Here, we study the impact of such stimulus anticipation on the actual response to a visual stimulus. Participants were to indicate the sex of deer and cattle on photographs of the respective animals. On some trials, participants were cued on the species of the upcoming animal whereas on other trials this was not the case. Time frequency analysis of the simultaneously recorded EEG revealed modulations by this cue stimulus in two time windows. Early [Formula: see text] spectral responses [Formula: see text] displayed strongest stimulus-locking for stimuli that were preceded by a cue if they were sufficiently large. Late [Formula: see text] responses displayed enhanced amplitudes in response to large stimuli and to stimuli that were preceded by a cue. For late responses, however, no interaction between cue and stimulus size was observed. We were able to explain these results in a simulation by prestimulus gain modulations (early response) and by decreased response thresholds (late response). Thus, it seems plausible, that stimulus anticipation results in a pretuning of local neural populations.
Authors:
Ingo Fründ; Jeanette Schadow; Niko A Busch; Nicole Naue; Ursula Körner; Christoph S Herrmann
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Publication Detail:
Type:  Journal Article     Date:  2008-05-07
Journal Detail:
Title:  Cognitive neurodynamics     Volume:  2     ISSN:  1871-4080     ISO Abbreviation:  Cogn Neurodyn     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-11-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101306907     Medline TA:  Cogn Neurodyn     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  89-100     Citation Subset:  -    
Affiliation:
Department of Biological Psychology , Institute of Psychology at the Otto-von-Guericke University, Magdeburg, Germany, ingo.fruend@ovgu.de.
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