Scotopic Vision Is Selectively Processed in Thick-Type Columns in Human Extrastriate Cortex.

ABSTRACT: In humans, visual stimuli can be perceived across an enormous range of light levels. Evidence suggests that different neural mechanisms process different subdivisions of this range. For instance, in the retina, stimuli presented at very low (scotopic) light levels activate rod photoreceptors, whereas cone photoreceptors are activated relatively more at higher (photopic) light levels. Similarly, different retinal ganglion cells are activated by scotopic versus photopic stimuli. However, in the brain, it remains unknown whether scotopic versus photopic information is: 1) processed in distinct channels, or 2) neurally merged. Using high-resolution functional magnetic resonance imaging at 7 T, we confirmed the first hypothesis. We first localized thick versus thin-type columns within areas V2,

SUBMITTER: Tootell RBH 

PROVIDER: S-EPMC7786355 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature