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Related Experiment Videos

Effects of monocular exposure to oriented lines on monkey striate cortex.

M Carlson, D H Hubel, T N Wiesel

    Brain Research
    |February 1, 1986
    PubMed
    Summary

    Infant monkeys exposed to a single line orientation in one eye did not develop a bias in their visual cortex. Instead, the occluded eye showed a lack of cells responding to orientations seen by the open eye, suggesting competition.

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    Multivariate behavioral research·2016

    Area of Science:

    • Neuroscience
    • Developmental Neuroscience
    • Visual Cortex Development

    Background:

    • Previous studies in kittens showed visual cortex cells biased to experienced orientations after monocular exposure.
    • Research on binocular exposure to restricted orientations yielded inconsistent results.
    • Infant monkey striate cortex exhibits adult-like specificity in responses to oriented lines.

    Purpose of the Study:

    • To investigate how restricting visual input to a single orientation affects striate cortex organization in infant macaques.
    • To clarify the phenomenon and mechanism of orientation bias development.
    • To determine if monocular exposure to a restricted orientation induces orientation preference in infant monkeys.

    Main Methods:

    • Three infant macaques (Macaca mulatta) were used.

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  • Each monkey had one eye exposed to lines of a single orientation, while the other eye was occluded via lid suture.
  • Electrophysiological recordings were made to assess cell responses and orientation preferences.

    • Main Results:

    • Few binocularly driven cells were found, with most cells dominated by the open eye.
    • Cells driven by the open eye showed normal representation of all orientation preferences; no bias towards the experienced orientation was observed.
    • Cells dominated by the occluded eye exhibited a deficit in responding to orientations experienced by the open eye.

    Conclusions:

    • Monocular visual experience to a restricted orientation does not induce an orientation bias in the open eye's representation in the infant macaque striate cortex.
    • A competitive mechanism between the two eyes appears to operate.
    • This competition may confer an orientation-selective advantage to the more visually active (open) eye.