Normalization by orientation-tuned surround in human V1-V3.

ABSTRACT: An influential account of neuronal responses in primary visual cortex is the normalized energy model. This model is often implemented as a multi-stage computation. The first stage is linear filtering. The second stage is the extraction of contrast energy, whereby a complex cell computes the squared and summed outputs of a pair of the linear filters in quadrature phase. The third stage is normalization, in which a local population of complex cells mutually inhibit one another. Because the population includes cells tuned to a range of orientations and spatial frequencies, the result is that the responses are effectively normalized by the local stimulus contrast. Here, using evidence from human functional MRI, we show that the classical model fails to account for the relative responses to two

SUBMITTER: Fang Z 

PROVIDER: S-EPMC10793941 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature