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Related Experiment Videos

Simulating unilateral neglect in normals using prism adaptation: implications for theory.

Carine Michel1, Laure Pisella, Peter W Halligan

  • 1Espace et Action, Institut National de la Santé et de la Recherche Médicale, Unité 534, Bron, France.

Neuropsychologia
|November 13, 2002
PubMed
Summary

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Adaptation to leftward-deviating prisms in healthy individuals reliably induces rightward bias on line bisection tasks. This suggests low-level sensorimotor adaptations significantly influence right hemisphere spatial cognition.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Unilateral visual neglect, often following right brain damage, is characterized by rightward deviation in line bisection.
  • Prism adaptation has shown potential in reducing neglect symptoms in clinical populations.

Purpose of the Study:

  • To investigate if prism adaptation in healthy individuals can replicate neglect-like biases.
  • To explore the role of sensorimotor adaptation in spatial cognition and right hemisphere organization.

Main Methods:

  • Healthy participants adapted to leftward-deviating prisms.
  • Line bisection tasks were used to measure directional bias before and after adaptation.
  • Experiments controlled for passive prism exposure versus adaptation.

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Main Results:

  • Leftward prism adaptation induced a reliable rightward bias on line bisection tasks in healthy individuals.
  • This bias was specific, modulated by target location, and showed a line length effect.
  • After-effects were confirmed to be due to prism adaptation, not mere exposure.

Conclusions:

  • Adaptation to left-deviating prisms in normals reliably produces a right-sided bias, mimicking aspects of visual neglect.
  • These findings suggest that low-level sensorimotor adaptations play a crucial role in right hemisphere organization for spatial cognition.