Predictive Coding in Area V4: Dynamic Shape Discrimination under Partial Occlusion.

ABSTRACT: The primate visual system has an exquisite ability to discriminate partially occluded shapes. Recent electrophysiological recordings suggest that response dynamics in intermediate visual cortical area V4, shaped by feedback from prefrontal cortex (PFC), may play a key role. To probe the algorithms that may underlie these findings, we build and test a model of V4 and PFC interactions based on a hierarchical predictive coding framework. We propose that probabilistic inference occurs in two steps. Initially, V4 responses are driven solely by bottom-up sensory input and are thus strongly influenced by the level of occlusion. After a delay, V4 responses combine both feedforward input and feedback signals from the PFC; the latter reflect predictions made by PFC about the visual stimulus underlyi

SUBMITTER: Choi H 

PROVIDER: S-EPMC5930045 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature