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Shifter circuits: a computational strategy for dynamic aspects of visual processing.

C H Anderson, D C Van Essen

    Proceedings of the National Academy of Sciences of the United States of America
    |September 1, 1987
    PubMed
    Summary
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    We introduce "shifter circuits" to dynamically control neural information flow in the visual pathway. This strategy aids in stereopsis, visual attention, and motion perception by realigning neural inputs and outputs.

    Area of Science:

    • Neuroscience
    • Computational Neuroscience
    • Visual System Research

    Background:

    • Dynamic control of neural information flow is crucial for complex visual processing.
    • Existing models struggle to explain how the visual system handles tasks like stereopsis, attention, and motion perception.

    Purpose of the Study:

    • To propose a general strategy for dynamic information flow control in the visual pathway.
    • To explain how neural circuits can dynamically adjust input-output mappings.
    • To address computational challenges in stereopsis, visual attention, and motion perception.

    Main Methods:

    • Proposed a novel neural circuit mechanism termed "shifter circuits".
    • Described how these circuits enable dynamic shifts in the alignment of neural input and output arrays.

    Related Experiment Videos

  • Explained the role of inhibitory neurons in controlling the direction of these shifts.

    • Main Results:

    • Shifter circuits allow dynamic realignment of neural representations without losing local spatial relationships.
    • The proposed mechanism involves incremental shifts across relay stages with diverging excitatory inputs.
    • The model is consistent with anatomical and physiological data of the primate visual pathway.

    Conclusions:

    • Shifter circuits provide a plausible mechanism for dynamic information flow control in the visual system.
    • This strategy offers a coherent explanation for visual functions like binocular fusion, attention shifts, and motion perception.
    • The hypothesis accounts for anatomical features, such as the high cell density in V1's geniculorecipient layers.