Stimulus-repetition effects on macaque V1 and V4 microcircuits explain gamma-synchronization increase.

ABSTRACT: Under natural conditions, animals repeatedly encounter the same visual scenes, objects or patterns repeatedly. These repetitions constitute statistical regularities, which the brain captures in an internal model through learning. A signature of such learning in primate visual areas V1 and V4 is the gradual strengthening of gamma synchronization. We used a V1-V4 Dynamic Causal Model (DCM) to explain visually induced responses in early and late epochs from a sequence of several hundred grating presentations. The DCM reproduced the empirical increase in local and inter-areal gamma synchronization, revealing specific intrinsic connectivity effects that could explain the phenomenon. In a sensitivity analysis, the isolated modulation of several connection strengths induced increased gamma. Compa

SUBMITTER: Katsanevaki C 

PROVIDER: S-EPMC11661063 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature