[Disinhibition as a mechanism of tuning of cross-like figures in the visual cortex neurons].
A discrete neural net was used for simulation of cross-sensitivity in 40% of neurones of the cat visual cortex' area 17th. It is based on disinhibition of the end-stopping inhibition in receptive field from the side-disinhibitory zone. Highly selective or invariant sensitivity of the simulated neurone in respect to shape and orientation of a cross-like figure was observed under changes of location, size and weight of the receptive field zones. The disinhibitory mechanism seems to be critically involved in the selection of the second-order features of the images in the primary visual cortex.
Shevelev
I A
IA
Institute of Higher Nervous Activity and Neurophysiology of the Russian Acad. Sci., Moscow, Russia.
Saltykov
K A
KA
D000818:Animals; D002415:Cats; D005556:Form Perception / Q000502:physiology; D008954:Models, Biological; D016571:Neural Networks, Computer; D009474:Neurons / Q000502:physiology*; D010775:Photic Stimulation; D014793:Visual Cortex / Q000166:cytology / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*