Properties and Possible Mechanisms of Response Modulation by the Receptive Field Surround in the Cat Primary Visual Cortex
- 143 Downloads
In neurons of the primary visual cortex (V1), the response to the grating stimulus presented in the classical receptive field (CRF) is suppressively modulated by the grating presented at the receptive field surround (SRF). This surround suppression (SS) depends on the relationship of stimulus parameters, such as orientation and spatial frequency, between the CRF and SRF gratings. The strength of SS depends on the stimulus contrast of both CRF and SRF. To assess the input mechanism underlying this stimulus-context-dependent suppression, we performed two series of experiments on the contribution of intracortical inhibition to SS and the nature of the contrast-gain control mechanism of SS.