A source for awareness-dependent figure-ground segregation in human prefrontal cortex.

ABSTRACT: Figure-ground modulation, i.e., the enhancement of neuronal responses evoked by the figure relative to the background, has three complementary components: edge modulation (boundary detection), center modulation (region filling), and background modulation (background suppression). However, the neuronal mechanisms mediating these three modulations and how they depend on awareness remain unclear. For each modulation, we compared both the cueing effect produced in a Posner paradigm and fMRI blood oxygen-level dependent (BOLD) signal in primary visual cortex (V1) evoked by visible relative to invisible orientation-defined figures. We found that edge modulation was independent of awareness, whereas both center and background modulations were strongly modulated by awareness, with greater modulati

SUBMITTER: Huang L 

PROVIDER: S-EPMC7720165 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature