Lookup NU author(s): Jose Herrero,
Dr Alwin Gieselmann,
Dr Louise Delicato,
Dr Sascha Gotthardt,
Professor Alexander Thiele
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Rhythmic activity of neuronal ensembles has been proposed to play an important role in cognitive functions such as attention, perception, and memory. Here we investigate whether rhythmic activity in VI of the macaque monkey (macaca mulatta) is affected by top-down visual attention. We measured the local field potential (LFP) and V1 spiking activity while monkeys performed an attention-demanding detection task. We show that gamma oscillations were strongly modulated by the stimulus and by attention. Stimuli that engaged inhibitory mechanisms induced the largest gamma LFP oscillations and the largest spike field coherence. Directing attention toward a visual stimulus at the receptive field of the recorded neurons decreased LFP gamma power and gamma spike field coherence. This decrease could reflect an attention-mediated reduction of surround inhibition. Changes in synchrony in Vi would thus be a byproduct of reduced inhibitory drive, rather than a mechanism that directly aids perceptual processing.
Author(s): Chalk M, Herrero JL, Gieselmann MA, Delicato LS, Gotthardt S, Thiele A
Publication type: Article
Publication status: Published
Print publication date: 14/04/2010
ISSN (print): 0896-6273
ISSN (electronic): 1097-4199
Publisher: Cell Press
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