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Reciprocal modulation of neuromagnetic induced gamma activity by attention in the human visual and auditory cortex.

Abstract：

:For attentional control of behavior, the brain permanently resolves a competition between the impressions supplied by different senses. Here, using a dual-modality temporal order detection task, we studied attentional modulation of oscillatory neuromagnetic activity in the human cerebral cortex. On each trial, after simultaneous exposure to visual and auditory noise, subjects were presented with an asynchronous pair of a visual and an auditory stimulus. Either of the two stimuli could occur first equally often, their order was not cued. Subjects had to determine the leading stimulus in a pair and attentively monitor it to respond upon its offset. With the attended visual or auditory stimuli, spectral power analysis revealed marked enhancements of induced gamma activity within 250 ms post-stimulus onset over the modality-specific cortices (occipital at 64 Hz, right temporal at 53 Hz). When unattended, however, the stimuli led to a significantly decreased (beneath baseline) gamma response in these cortical regions. The gamma decreases occurred at lower frequencies ( approximately 30 Hz) than did the gamma increases. An increase in the gamma power and frequency for the attended modality and their decrease for the unattended modality suggest that attentional regulation of multisensory processing involves reciprocal changes in synchronization of respective cortical networks. We assume that the gamma decrease reflects an active suppression of the task-irrelevant sensory input. This suppression occurs at lower frequencies, suggesting an involvement of larger scale cell assemblies.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Sokolov A,Pavlova M,Lutzenberger W,Birbaumer N

doi

10.1016/j.neuroimage.2004.01.045

keywords:

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

521-9

issue

2

eissn

1053-8119

issn

1095-9572

pii

S1053811904000813

journal_volume

22

pub_type

杂志文章

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