Increased Visual Stimulation Systematically Decreases Activity in Lateral Intermediate Cortex.

ABSTRACT: Previous studies have attributed multiple diverse roles to the posterior superior temporal cortex (STC), both visually driven and cognitive, including part of the default mode network (DMN). Here, we demonstrate a unifying property across this multimodal region. Specifically, the lateral intermediate (LIM) portion of STC showed an unexpected feature: a progressively decreasing fMRI response to increases in visual stimulus size (or number). Such responses are reversed in sign, relative to well-known responses in classic occipital temporal visual cortex. In LIM, this "reversed" size function was present across multiple object categories and retinotopic eccentricities. Moreover, we found a significant interaction between the LIM size function and the distribution of subjects' attention. These

SUBMITTER: Nasr S 

PROVIDER: S-EPMC4585529 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature