The effects of orientation and attention during surround suppression of small image features: A 7 Tesla fMRI study.

ABSTRACT: Although V1 responses are driven primarily by elements within a neuron's receptive field, which subtends about 1° visual angle in parafoveal regions, previous work has shown that localized fMRI responses to visual elements reflect not only local feature encoding but also long-range pattern attributes. However, separating the response to an image feature from the response to the surrounding stimulus and studying the interactions between these two responses demands both spatial precision and signal independence, which may be challenging to attain with fMRI. The present study used 7 Tesla fMRI with 1.2-mm resolution to measure the interactions between small sinusoidal grating patches (targets) at 3° eccentricity and surrounds of various sizes and orientations to test the conditions under whic

SUBMITTER: Schallmo MP 

PROVIDER: S-EPMC5015919 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature