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Related Experiment Videos

Memory-guided saccades: what is memorized?

I Israël1

  • 1Laboratoire de Physiologie Neurosensorielle, CNRS, Paris, France.

Experimental Brain Research
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

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Extraretinal input alone is insufficient for accurate saccadic control. Memory-guided saccades rely on retinal input, with accuracy decreasing with delay, except during smooth pursuit.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Science

Background:

  • The oculomotor system requires precise information for saccadic control.
  • Extraretinal (internal) and retinal (external) inputs play roles in visual-motor tasks.

Purpose of the Study:

  • To determine if extraretinal input alone can guide saccadic control.
  • To investigate the influence of different sensory inputs on memory-guided saccades.

Main Methods:

  • Two subjects performed memory-guided saccades in darkness after target acquisition.
  • Acquisition conditions included visually-guided saccades (retinal + extraretinal), fixation with peripheral target (retinal only), and smooth pursuit (extraretinal only).
  • Saccade accuracy was assessed after 2s and 12s delays.

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Main Results:

  • Memory-guided saccades were accurate with prior external input but not internal input alone.
  • Accuracy decreased with increased delay for retinal input conditions.
  • Accuracy improved with delay in the smooth pursuit (internal input only) condition.
  • Combined retinal and oculomotor input yielded better accuracy than single input.

Conclusions:

  • Extraretinal input alone is insufficient for accurate saccadic control.
  • Retinal input is crucial for precise memory-guided saccades.
  • The interaction between retinal and extraretinal inputs influences saccadic accuracy.