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Free keywords:
Stdp
adaptation
area V1
gamma oscillations
learning
memory
plasticity
primate
repetition suppression
stimulus repetition
beneficiary of a respective license contract with Blackrock Microsystems LLC (Salt
Lake City, UT)
he is a member of the Scientific Technical Advisory Board of CorTec
GmbH (Freiburg, Germany) and managing director of Brain Science GmbH (Frankfurt am
Main, Germany).
Abstract:
When a visual stimulus is repeated, average neuronal responses typically decrease, yet they might maintain or even increase their impact through increased synchronization. Previous work has found that many repetitions of a grating lead to increasing gamma-band synchronization. Here, we show in awake macaque area V1 that both repetition-related reductions in firing rate and increases in gamma are specific to the repeated stimulus. These effects show some persistence on the timescale of minutes. Gamma increases are specific to the presented stimulus location. Further, repetition effects on gamma and on firing rates generalize to images of natural objects. These findings support the notion that gamma-band synchronization subserves the adaptive processing of repeated stimulus encounters.
