[Simulation of mechanisms of tuning to incomplete cross-like figures in neurons of visual cortex].
We performed a digital simulation of the receptive fields (RF) of cat cortical neurons in the area 17 that are able to detect cross-like figures with partly masked central or peripheral fragments. It was shown that the reciprocal interaction between the RF center and periphery may produce sharp, selective, and pronounced tuning to a cross shape and orientation due to blocking the end-stopping inhibition in the RF by its side-disinhibitory zone. Under conditions of cooperative interaction between the RF center and periphery the sensitivity index (cross/bar response ratio) was typically lower than in the reciprocal model. Features of the model that are critical for sensitivity to cross in cases of small or incomplete figures (the shape, localization, and weight of the RF zones) are specified.
Saltykov
K A
KA
Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow.
Shchevelev
I A
IA
D000818:Animals; D002415:Cats; D009433:Neural Inhibition; D016571:Neural Networks, Computer; D009474:Neurons / Q000502:physiology*; D010775:Photic Stimulation; D014793:Visual Cortex / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*