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Related Experiment Videos

Egocentric body-centered coordinates modulate visuomotor performance.

Mary M Hasselbach-Heitzeg1, Patricia A Reuter-Lorenz

  • 1Department of Psychiatry, The University of Michigan, 400 E. Eisenhower Parkway, Suite 2A, Ann Arbor, MI 48108-3318, USA. mheitzeg@umich.edu

Neuropsychologia
|June 14, 2002
PubMed
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Altering body midline alignment in healthy adults created spatial biases similar to unilateral neglect. This suggests distorted body-centered frames contribute to clinical neglect.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Parietal lobe damage is linked to unilateral neglect, characterized by ipsilesional spatial bias.
  • This bias is thought to stem from distortions in the body-centered coordinate frame.

Purpose of the Study:

  • To investigate the role of the egocentric frame in visuomotor performance.
  • To examine how manipulating body midline alignment affects neurologically-intact adults.

Main Methods:

  • Two experiments were conducted involving neurologically-intact adults.
  • Participants' body midline alignment was manipulated (rightward and leftward rotation).
  • Visuomotor performance, including detection times and visual sensitivity, was measured for lateralized targets.

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Main Results:

  • Rightward body rotation led to a right visual field advantage in detection times.
  • Rightward rotation increased visual sensitivity for right visual field targets and decreased it for left visual field targets.
  • Leftward rotation had minimal effects on response latency and sensitivity but mildly affected response criterion.

Conclusions:

  • Manipulating the body-centered frame can induce neglect-like asymmetries in healthy individuals.
  • These findings support the hypothesis that altered body-centered representations contribute to clinical unilateral neglect.