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  • Title: [Standardness and invariability of the detector tuning of neurons in the orientation column of the visual cortex of the cat].
    Author: Shevelev IA, Lazareva NA, Novikova RV, Tikhomirov AS.
    Journal: Neirofiziologiia; 1985; 17(2):175-82. PubMed ID: 4000301.
    Abstract:
    The variability of neuron orientation tuning in separate columns and the degree of it stability under changes in levels of the contrast between stimulus and background were studied in experiments on unanesthetized, relaxed cats. Several types of orientation columns were revealed: with a relatively high, standard and stable orientation tuning; with a widely changing orientation tuning from neuron to neuron; with invariance to contrast level; with variant orientation tuning; with mixed (invariant-variant) properties. In the columns, standard-nonstandard properties, on the one hand, and properties of invariability-variability, on the other hand, could combine in different ways. More often differences of orientation tuning within a column were observed between neurons of upper and lower cortical layers. Possible distinctions in the functional role of types of orientation tuning in columns described and in mechanisms of formation of detector properties of their neurons are discussed.
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