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Timing and computation in inner retinal circuitry.

Stephen A Baccus1

  • 1Department of Neurobiology, Stanford University School of Medicine, Stanford, California 94305, USA. baccus@stanford.edu

Annual Review of Physiology
|October 25, 2006
PubMed
Summary
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The inner retina processes visual information through distinct temporal channels created by bipolar and amacrine cells. This circuitry enables computations for motion detection and eye movement suppression.

Area of Science:

  • Neuroscience
  • Retinal Physiology
  • Visual Processing

Background:

  • The vertebrate inner retina is the second stage of visual processing, transforming visual scenes before transmission via the optic nerve.
  • Understanding inner retinal circuitry is crucial for deciphering visual computations and the neural code.
  • Bipolar cells transmit filtered input to distinct strata in the inner plexiform layer, receiving unique excitation/inhibition patterns.

Purpose of the Study:

  • To review the connections between higher-level visual processing, neural code descriptions, inner retinal circuitry, and visual computations.
  • To explain how distinct temporal channels in the inner retina are formed and interact.
  • To highlight the role of amacrine cells in modulating visual signals.

Main Methods:

Related Experiment Videos

  • Review of existing literature on inner retinal circuitry and visual computations.
  • Analysis of the roles of bipolar cells and amacrine cells in signal processing.
  • Discussion of mathematical descriptions of the neural code in relation to retinal function.

    • Main Results:

    • Bipolar cells deliver spatially and temporally filtered input to approximately ten anatomical strata in the inner plexiform layer.
    • Distinct temporal channels arise from unique combinations of excitation and inhibition within these layers.
    • Amacrine cells, particularly wide-field types, mediate inhibitory interactions within and between layers, shaping signal kinetics.

    Conclusions:

    • The described mechanisms and properties of inner retinal circuitry contribute to computations for detecting differential motion.
    • These computations also serve to suppress the visual effects of eye movements.
    • The inner retina employs specialized circuitry to selectively process and transmit visual information.