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Updated: Jul 5, 2026

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The "diagonal effect": a systematic error in oblique antisaccades.

John D Koehn1, Elizabeth Roy, Jason J S Barton

  • 1Human Vision and Eye Movement Laboratory, University of British Columbia, Vancouver, Canada.

Journal of Neurophysiology
|May 24, 2008
PubMed
Summary
This summary is machine-generated.

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Antisaccades, or voluntary eye movements to the opposite side of a visual target, show a systematic directional error. Oblique antisaccades deviate toward diagonal meridians, suggesting a common spatial bias in perception.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Psychology

Background:

  • Antisaccades exhibit greater variability and hypometria compared to prosaccades.
  • Previous research focused on antisaccade amplitude errors, not directional accuracy.

Purpose of the Study:

  • To investigate systematic directional errors in human antisaccades.
  • To determine if antisaccades deviate towards specific meridians.

Main Methods:

  • Human subjects performed prosaccades and antisaccades to various target locations.
  • Experiments varied the number and arrangement of target locations per block.
  • Analysis focused on saccadic trajectory deviations.

Main Results:

  • Oblique antisaccades systematically deviated towards the 45-degree diagonal meridians.

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  • Prosaccades did not show this diagonal deviation.
  • The effect persisted across different experimental designs and was not due to range effects.

    • Conclusions:

    • A consistent directional bias exists in antisaccade performance.
    • This diagonal effect in antisaccades may stem from perceptual mechanisms.
    • The findings suggest a shared spatial bias in processing uncertain spatial information across different tasks.