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Modulatory influences of a moving visual noise background on bar-evoked responses of cells in area 18 of the feline visual cortex

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Summary

The modulatory influence of a synchronously moving visual noise background on responsiveness to an optimally-oriented moving bar stimulus was investigated in visual cortical area 18 of the lightly-anaesthetized cat. The bar and noise background were swept along the axis orthogonal to bar orientation, with the same phase, velocity and amplitude of motion. Cells which were insensitive to motion of visual noise per se or weakly responsive to individual ‘grains’ in the noise sample showed suppression of bar-evoked responses by simultaneous motion of the noise background. Percent suppression declined with increase in bar length, over a range which could exceed the maximum estimate of receptive field length. The decline in percent suppression was non-linear, becoming progressively flatter in slope as bar length was increased until an asymptotic value was reached; observations on end-stopped cells and on end-free cells with restricted length summation verified that percent suppression was related specifically to the length of the comparison bar and not to the strength of response it evoked. Percent suppression and the extent over which it declined with increase in bar length were comparable for preferred and opposite directions of bar motion even in cells with radically different length-response functions in the two directions, including end-stopped cells with direction-selective end-zones. In contrast to end-inhibition, which was maximal at or near the preferred velocity for a bar of optimal length, percent suppression by motion of the noise background was essentially velocity-invariant; in velocity tuned and velocity high-pass cells, background motion reduced the slope(s) of the velocity-response function, implying that the suppressive action of moving noise backgrounds is divisive rather than subtractive. It is argued that the suppression derives predominantly from an axo-somatic noise-sensitive inhibitory input from superficial- and deep-layer, large basket cells in orientation ‘columns’ at some distance from those of their target cells.

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Author notes

  1. J. M. Crook

    Present address: Abteilung Neurophysiologie, Medizinische Fakultät, Ruhr-Universität Bochum, Postfach 102148, D-4630, Bochum l, Federal Republic of Germany

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  1. Department of Communication and Neuroscience, University of Keele, ST5 5BG, Keele, Staffordshire, UK

    J. M. Crook

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Crook, J.M. Modulatory influences of a moving visual noise background on bar-evoked responses of cells in area 18 of the feline visual cortex. Exp Brain Res 80, 562–576 (1990). https://doi.org/10.1007/BF00227996

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  • DOI: https://doi.org/10.1007/BF00227996

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