Contextual Interactions in Grating Plaid Configurations Are Explained by Natural Image Statistics and Neural Modeling.

ABSTRACT: Processing natural scenes requires the visual system to integrate local features into global object descriptions. To achieve coherent representations, the human brain uses statistical dependencies to guide weighting of local feature conjunctions. Pairwise interactions among feature detectors in early visual areas may form the early substrate of these local feature bindings. To investigate local interaction structures in visual cortex, we combined psychophysical experiments with computational modeling and natural scene analysis. We first measured contrast thresholds for 2 × 2 grating patch arrangements (plaids), which differed in spatial frequency composition (low, high, or mixed), number of grating patch co-alignments (0, 1, or 2), and inter-patch distances (1° and 2° of visual angle). Con

SUBMITTER: Ernst UA 

PROVIDER: S-EPMC5048088 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature