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Two-Dimensional Perisaccadic Visual Mislocalization in Rhesus Macaque Monkeys.

Matthias P Baumann1,2, Ziad M Hafed1,2

  • 1Werner Reichardt Centre for Integrative Neuroscience, University of Tübingen, Tübingen, Germany, 72076.

Eneuro
|May 21, 2025
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Summary
This summary is machine-generated.

Perceptual localization errors during eye movements, known as perisaccadic mislocalization, were studied in monkeys. This new paradigm reveals mislocalization strength depends on saccade direction, similar to humans.

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Area of Science:

  • Neuroscience
  • Vision Science
  • Ophthalmology

Background:

  • Perisaccadic visual mislocalization is a significant error in visual perception during eye movements.
  • Understanding the neural basis of this phenomenon requires animal models.
  • Existing paradigms are limited by specific saccade directions, hindering neurophysiological studies.

Purpose of the Study:

  • To establish a versatile perisaccadic mislocalization paradigm in non-human primates.
  • To investigate the influence of saccade direction on visual mislocalization.
  • To provide a foundation for future neurophysiological research into visual perception during saccades.

Main Methods:

  • Developed a novel two-dimensional mislocalization task for rhesus macaque monkeys.
  • Monkeys performed memory-guided saccades to remembered flash locations.
  • Analyzed mislocalization errors in relation to saccade onset and flash presentation.

Main Results:

  • Monkeys successfully learned the task and exhibited backward mislocalization, consistent with human studies.
  • Mislocalization strength was found to be dependent on saccade direction, particularly for upward saccades.
  • Results showed stronger mislocalization for upper visual field flashes during horizontal saccades, mirroring human perception.

Conclusions:

  • Successfully established a robust and adaptable two-dimensional perisaccadic mislocalization paradigm in monkeys.
  • Demonstrated that saccade direction significantly influences the strength of visual mislocalization in primates.
  • This paradigm facilitates future neurophysiological investigations into the neural mechanisms of perisaccadic visual errors.