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Evidence for a range effect in the saccadic system.

Z Kapoula

    Vision Research
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Saccadic eye movements, or rapid eye movements, are not always undershooting targets. Research shows these eye movements exhibit a range effect, similar to manual tracking, where performance is biased by previously viewed distances.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Cognitive Psychology

    Background:

    • Saccadic eye movements are typically believed to undershoot targets by approximately 10%.
    • A known response bias in manual tracking, the range effect, causes overestimation of small distances and underestimation of large distances.

    Purpose of the Study:

    • To investigate whether saccadic eye movements exhibit a range effect.
    • To determine if saccades can be systematically biased to overshoot or undershoot targets.

    Main Methods:

    • Experiments were conducted using two distinct sets of target distances with partial overlap.
    • Saccadic responses were analyzed in relation to the distribution of target distances presented.

    Main Results:

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  • Saccadic eye movements demonstrate a range effect, mirroring findings in manual tracking.
  • The direction of saccadic error (overshoot or undershoot) was systematically influenced by the set of target distances used.

    • Conclusions:

    • Saccadic eye movements are susceptible to range effects, challenging the notion of consistent undershooting.
    • The contextual set of target distances can modulate saccadic behavior, leading to systematic overshoots or undershoots.