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Related Experiment Videos

Accuracy of memory-guided saccades.

K Ohtsuka1, M Sawa, M Takeda

  • 1Department of Ophthalmology, Sapporo Medical College, Hokkaido, Japan.

Ophthalmologica. Journal International D'Ophtalmologie. International Journal of Ophthalmology. Zeitschrift Fur Augenheilkunde
|January 1, 1989
PubMed
Summary

Memory-guided saccades in the dark often overshoot targets. The brain uses nonvisual error signals to correct eye movements when the error exceeds approximately 5 degrees, indicating distinct control mechanisms from visually guided saccades.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Motor Control

Background:

  • Accurate eye movements are crucial for visual perception.
  • Understanding the control of eye movements in the absence of visual feedback is essential.

Purpose of the Study:

  • To investigate the accuracy of memory-guided saccades in normal subjects.
  • To determine the role of error signals in controlling eye movements in the dark.

Main Methods:

  • Eleven normal subjects performed memory-guided saccades of varying amplitudes (20-80 degrees) in darkness.
  • Saccade accuracy and the occurrence of corrective saccades were analyzed.
  • Data were collected after initial visual fixation targets were removed.

Main Results:

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  • Most memory-guided saccades overshot the intended target.
  • Corrective saccades were observed for larger errors (mean 12.7 +/- 7.3 degrees) but not for smaller errors (mean 4.3 +/- 4.0 degrees).
  • Saccade accuracy decreased over time, but corrections occurred for errors exceeding approximately 5 degrees.

Conclusions:

  • Memory-guided saccades are not simple repetitions of visually guided saccades.
  • Nonvisual error signals play a significant role in regulating eye movements during memory-guided saccades.
  • These findings highlight distinct neural mechanisms for visually guided versus memory-guided eye movements.