Abstract
Using extracellular recording methods,the authors measured the contrast response function of the inhibitory extra-receptive field of 41 cells in the cat primary visual cortex,when stimulating the classical receptive field(CRF) only or simultaneously stimulating CRF and extra-receptive field(ERF).The results showed that a large contrast stimulus with the preferred orientation that covered ERF and CRF resulted in the increment in dynamic range of contrast response function and the decrement in contrast gain and response gain.However,the discontinuity between CRF and ERF in stimulation orientation largely removed the inhibitory effects of ERF of some cells,and resulted in the increment of the dynamic range of the contrast response function and increment of contrast gain and response gain.
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