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Related Experiment Videos

Evidence for a supplementary eye field.

J Schlag, M Schlag-Rey

    Journal of Neurophysiology
    |January 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Researchers identified a supplementary eye field in the dorsomedial frontal cortex of monkeys. This area controls saccadic eye movements and shows unique neural activity patterns, distinct from other frontal eye fields.

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    Journal of neurophysiology·1998

    Area of Science:

    • Neuroscience
    • Primate Motor Control

    Background:

    • The existence of an oculomotor area rostral to the supplementary motor area was postulated.
    • Understanding frontal eye fields is crucial for deciphering motor control mechanisms.

    Purpose of the Study:

    • To identify and characterize a novel oculomotor area in the dorsomedial frontal cortex.
    • To investigate the properties of saccadic eye movements evoked by electrical microstimulation.
    • To record and analyze neuronal activity related to eye movements in this region.

    Main Methods:

    • Electrical microstimulation and unit recording in the dorsomedial frontal cortex of alert monkeys.
    • Evoking contraversive saccades and analyzing response latencies and thresholds.
    • Recording presaccadic unit activity and responses to visual stimuli and fixation.

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    Main Results:

    • 129 sites yielded contraversive saccades, with low thresholds (<20 microA) and latencies >30 ms.
    • Evoked saccades varied from uniform to goal-convergent, with gradual transitions.
    • Presaccadic unit activity correlated with movement direction and preceded self-initiated saccades by >300 ms.
    • Some neurons showed tonic activity during fixation and responded to photic stimuli.

    Conclusions:

    • The identified area functions as a supplementary eye field, sharing properties with the arcuate frontal eye field.
    • Distinct features include longer response latencies, goal-convergent saccades, and long-lead presaccadic activity.
    • This study provides evidence for a distinct oculomotor control region within the frontal cortex.