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Related Experiment Videos

Prism adaptation with delayed visual error signals in the monkey.

Shigeru Kitazawa1, Ping-Bo Yin

  • 1Neuroscience Reserach Institute, National Institute of advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba 305-8568, Japan. kitazawa-s@aist.go.jp

Experimental Brain Research
|May 16, 2002
PubMed
Summary
This summary is machine-generated.

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Prism adaptation in monkeys relies on visual feedback within 50 ms. Monkeys lack a mechanism for delayed visual feedback seen in humans, suggesting shared and distinct adaptation pathways.

Area of Science:

  • Neuroscience
  • Motor Control
  • Sensory Adaptation

Background:

  • Prism adaptation demonstrates the brain's ability to adjust motor commands based on visual feedback.
  • Previous studies show adaptation occurs even with delayed error signals.

Purpose of the Study:

  • To investigate the temporal limits of visual feedback for prism adaptation in monkeys.
  • To compare the time window for prism adaptation between monkeys and humans.

Main Methods:

  • Monkeys performed reaching movements with visual field displacement using wedge prisms.
  • Terminal visual feedback was delayed by 0, 10, 50, 100, or 500 ms after movement completion.
  • Adaptation speed and after-effect size were measured at each delay interval.

Related Experiment Videos

Main Results:

  • Prism adaptation was fastest with 0-10 ms delays and significantly decreased with a 50 ms delay.
  • Adaptation approached zero at a 500 ms delay, with a corresponding decrease in after-effect size.
  • Monkeys showed significant impairment in adaptation with delays exceeding 50 ms.

Conclusions:

  • Prism adaptation in monkeys critically depends on visual information available within 50 ms of movement completion.
  • Monkeys and humans share a rapid visual feedback adaptation mechanism (approx. 50 ms).
  • Monkeys appear to lack a slower adaptation mechanism present in humans, which tolerates visual delays up to 500 ms or more.