Contrast response characteristics of longrange lateral interactions in cat striate cortex

Chien Chung Chen, Takuji Kasamatsu, Uri Polat, Anthony M. Norcia

Research output: Contribution to journalArticlepeer-review

80 Scopus citations

Abstract

Single-cell responses in visual cortex to a target, falling within their receptive field can be modified by collinear flanking stimuli concurrently presented outside the receptive field. Here, we report the presence of four types of contrast-dependent lateral effects: (1) facilitation at low target contrasts and suppression at high contrasts, (2) facilitation that increases with contrast, (3) suppression that increases with contrast, and (4) suppression at low contrasts with facilitation at high contrasts. We propose a sensitivity modulation model that accounts for all the four types of lateral effects by changes in two parameters. In this model, activation of neighboring neurons changes the sensitivities of the target neuron to both the direct feedforward input and inhibitory, divisive feedback from neighboring neurons.

Original languageEnglish
Pages (from-to)655-661
Number of pages7
JournalNeuroReport
Volume12
Issue number4
DOIs
StatePublished - 26 Mar 2001
Externally publishedYes

Keywords

  • Contrast response function
  • Gabor patches
  • Gain control
  • Sensitivity modulation
  • Spatial summation

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