Anticipation of natural stimuli modulates EEG dynamics: physiology and simulation |
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Authors: | Ingo Fründ Jeanette Schadow Niko A Busch Nicole Naue Ursula Körner Christoph S Herrmann |
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Institution: | (1) Department of Biological Psychology , Institute of Psychology at the Otto-von-Guericke University, Magdeburg, Germany;(2) Leibniz Institute for Neurobiology, Magdeburg, Germany;(3) Bernstein Group for Computational Neuroscience, Magdeburg, Germany;(4) CNRS-Centre de Recherche Cerveau & Cognition, Toulouse, France;(5) Honda Research Institute Europe, Offenbach, Germany;(6) Center for Behavioral Brain Sciences, Magdeburg, Germany |
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Abstract: | 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 spectral responses displayed strongest stimulus-locking for stimuli that were preceded by a cue if they were sufficiently large. Late 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. |
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Keywords: | Beta Gamma Gain Threshold EEG Vision |
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