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Related Experiment Videos

Visual receptive fields sensitive to absolute and relative motion during tracking.

B Bridgeman

    Science (New York, N.Y.)
    |December 8, 1972
    PubMed
    Summary
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    Neurons in the visual cortex distinguish between object motion and self-motion during visual tracking. This finding helps differentiate world motion from retinal image translation during eye movements.

    Area of Science:

    • Neuroscience
    • Visual Neuroscience
    • Primate Vision

    Background:

    • Understanding how the brain processes visual motion is crucial for comprehending perception.
    • Distinguishing between self-generated motion (eye movements) and external object motion is a fundamental challenge for the visual system.

    Purpose of the Study:

    • To investigate how neurons in the visual cortex differentiate between stimulus motion relative to a background and absolute stimulus motion during visually guided eye movements.
    • To identify neuronal populations responsible for distinguishing world-referred motion from retinal image translation.

    Main Methods:

    • Electrophysiological recordings from neurons in the visual cortex of awake, behaving monkeys.
    • Utilizing two distinct experimental conditions: one matching eye movements and another matching retinal image motion.

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  • Presenting moving visual stimuli while monkeys performed visually tracking tasks.

    • Main Results:

    • Identified two distinct neuronal populations in the visual cortex.
    • One population responded selectively to stimulus motion relative to a background (world-referred motion).
    • Another population responded to any form of stimulus motion, irrespective of its relation to the background or eye movements.

    Conclusions:

    • The visual cortex contains neurons capable of discriminating between object motion and self-motion cues.
    • These findings provide a neural basis for differentiating the motion of objects in the world from the motion of the retinal image caused by eye movements.
    • This neuronal selectivity is essential for accurate visual perception and navigation.