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Related Experiment Videos

Effective sampling time for saccadic eye movement from experiments using a vergence input

B L Zuber, L Djordjevich

    American Journal of Optometry and Physiological Optics
    |September 1, 1980
    PubMed
    Summary

    The saccadic system has a 0.2-degree dead zone and a sampling time. Saccade latency depends on target velocity, with distinct time segments influencing response.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Systems Biology

    Background:

    • The saccadic system, crucial for rapid eye movements, is complex.
    • Understanding its response dynamics to visual stimuli is vital.

    Purpose of the Study:

    • To analyze the amplitude and latency of the saccadic component of the compound response.
    • To investigate the saccadic system's operational characteristics, including dead zone and sampling time.

    Main Methods:

    • Analysis of saccadic component amplitude and latency.
    • Quantification of the saccadic system's dead zone size.
    • Decomposition of saccade latency into distinct time segments based on target velocity.

    Main Results:

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  • The saccadic system exhibits a dead zone of 0.2 degrees.
  • Saccade latency comprises three segments: dead zone crossing, sampling, and post-sampling.
  • The time to cross the dead zone is inversely proportional to target velocity.
  • The sampling segment has a constant duration of 191 msec.
  • The post-sampling segment duration varies with target velocity, being constant (~70 msec) at zero velocity.

    • Conclusions:

    • The saccadic system operates with a defined dead zone and effective sampling time.
    • Target velocity significantly influences saccade latency dynamics.
    • These findings provide insights into the temporal processing of the saccadic system.