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Related Experiment Videos

Countermanding saccades in macaque

D P Hanes1, J D Schall

  • 1Department of Psychology, Vanderbilt University, Nashville, TN 37240, USA.

Visual Neuroscience
|September 1, 1995
PubMed
Summary
This summary is machine-generated.

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Researchers studied saccade initiation using a countermanding paradigm. Monkeys could inhibit visually triggered eye movements, with inhibition success depending on stop signal timing, revealing crucial insights into motor control.

Area of Science:

  • Neuroscience
  • Oculomotor Research
  • Cognitive Psychology

Background:

  • Saccade initiation is a fundamental motor behavior.
  • Understanding the control mechanisms for voluntary eye movements is crucial.
  • Previous research has explored factors influencing saccade generation.

Purpose of the Study:

  • To investigate the regulation of saccade initiation using a countermanding paradigm.
  • To determine the time course of inhibitory control over saccade production.
  • To estimate the stop signal reaction time in rhesus monkeys.

Main Methods:

  • Utilized a countermanding paradigm with two rhesus monkeys.
  • Monkeys were instructed to generate saccades to peripheral targets.
  • A stop signal was introduced after a variable delay to test inhibition of saccade initiation.

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Main Results:

  • Monkeys successfully withheld saccades with short delays between target presentation and stop signal.
  • Increasing the stop signal delay led to a higher failure rate in withholding saccades.
  • Estimated average stop signal reaction time was 82 ms for both monkeys.

Conclusions:

  • The countermanding paradigm effectively probes the regulation of saccade initiation.
  • Stop signal reaction time provides a measure of inhibitory control over motor responses.
  • This paradigm is valuable for studying the neural basis of saccade control.