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Related Experiment Videos

Auditory receptive fields in primate superior colliculus shift with changes in eye position.

M F Jay, D L Sparks

    Nature
    |May 24, 1984
    PubMed
    Summary

    Sensory maps in the superior colliculus (SC) align auditory and visual information. Auditory receptive fields shift with eye position, ensuring sensory maps remain registered for coordinated eye movements.

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    Area of Science:

    • Neuroscience
    • Sensory processing
    • Motor control

    Background:

    • The superior colliculus (SC) integrates auditory, visual, and somatosensory information for movement control.
    • Neurones in the SC fire before saccadic eye movements, suggesting a role in sensory-to-motor transformation.
    • The coordinate systems for sensory inputs differ, raising questions about how they are integrated within the SC.

    Purpose of the Study:

    • To investigate the spatial relationship between auditory and visual maps in the primate superior colliculus.
    • To determine if sensory maps in the SC remain aligned across different eye positions in behaving animals.

    Main Methods:

    • Extracellular single-unit recordings were performed in alert, behaving monkeys with head fixation.
    • Monkeys were trained to execute delayed saccadic eye movements to auditory or visual targets.

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  • Auditory and visual receptive fields were mapped across different initial fixation points.

    • Main Results:

    • Auditory receptive fields dynamically shifted their spatial location in response to changes in eye position.
    • The visual map, organized retinotopically, and the auditory map were found to remain in register.
    • This dynamic adjustment allows for the integration of sensory information across different reference frames.

    Conclusions:

    • The superior colliculus maintains aligned auditory and visual maps through eye-position-dependent shifts in auditory receptive fields.
    • This mechanism is crucial for transforming spatially diverse sensory inputs into unified motor commands for accurate eye movements.
    • The findings suggest the SC operates with a motor-centric coordinate system for sensory-motor integration.