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Binocularly deprived cats: binocular tests of cortical cells show regular patterns of interaction

I Ohzawa and RD Freeman
Journal of Neuroscience 1 July 1988, 8 (7) 2507-2516; DOI: https://doi.org/10.1523/JNEUROSCI.08-07-02507.1988
I Ohzawa
Group in Neurobiology, University of California, Berkeley 94720.
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RD Freeman
Group in Neurobiology, University of California, Berkeley 94720.
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Abstract

If an animal is prevented from receiving visual experience during an early developmental phase, pronounced dysfunctions are observed. Physiological tests reveal gross abnormalities in the striate cortex. Cells in visual cortex are either unresponsive of their response characteristics are erratic. Although fewer than normal numbers of binocular cells are found in cats reared with binocular lid suture, a population remains that can be activated by stimulation through either eye. We have studied cortical cells in binocularly deprived cats in order to specify monocular and binocular response characteristics. The primary hypothesis we have examined is that the abnormal response properties of these cells are a result of an irregular structure or substructure of the receptive fields. Kittens were binocularly lid- sutured soon after birth, and were studied physiologically at ages between 7 and 11 months. Standard techniques were used to record from single cells in striate cortex. Drifting gratings were presented to either eye or to both eyes together. In the latter case, the relative interocular phase was varied between the gratings so that the retinal disparity of the stimuli was changed. We confirmed the expected finding that most cells were either unresponsive or erratic in their response. Of the cells that responded, monocular tuning functions for orientation and spatial frequency of the stimulus were often irregular. However, even in these cases, binocular interaction patterns of cortical responses were nearly always highly regular and displayed phase- specific profiles. A model is presented that explains this finding and suggests how binocular deprivation may result in disorganized receptive- field structure.

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The Journal of Neuroscience: 8 (7)
Journal of Neuroscience
Vol. 8, Issue 7
1 Jul 1988
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Binocularly deprived cats: binocular tests of cortical cells show regular patterns of interaction
I Ohzawa, RD Freeman
Journal of Neuroscience 1 July 1988, 8 (7) 2507-2516; DOI: 10.1523/JNEUROSCI.08-07-02507.1988

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Binocularly deprived cats: binocular tests of cortical cells show regular patterns of interaction
I Ohzawa, RD Freeman
Journal of Neuroscience 1 July 1988, 8 (7) 2507-2516; DOI: 10.1523/JNEUROSCI.08-07-02507.1988
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