Theta, but Not Gamma Oscillations in Area V4 Depend on Input from Primary Visual Cortex.

ABSTRACT: Theta (3-9 Hz) and gamma (30-100 Hz) oscillations have been observed at different levels along the hierarchy of cortical areas and across a wide set of cognitive tasks. In the visual system, the emergence of both rhythms in primary visual cortex (V1) and mid-level cortical areas V4 has been linked with variations in perceptual reaction times.^1-5 Based on analytical methods to infer causality in neural activation patterns, it was concluded that gamma and theta oscillations might both reflect feedforward sensory processing from V1 to V4.^6-10 Here, we report on experiments in macaque monkeys in which we experimentally assessed the presence of both oscillations in the neural activity recorded from multi-electrode arrays in V1 and V4 before and after a permanent V1 lesion.

SUBMITTER: Kienitz R 

PROVIDER: S-EPMC8018535 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature