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Related Experiment Videos

Reaching within a dynamic virtual environment.

Assaf Y Dvorkin1, Robert V Kenyon, Emily A Keshner

  • 1Sensory Motor Performance Program, Rehabilitation Institute of Chicago, 345 East Superior Street, Chicago, IL 60611, USA. a-dvorkin@northwestern.edu

Journal of Neuroengineering and Rehabilitation
|July 6, 2007
PubMed
Summary
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Altering the visual field during reaching tasks disrupts visuomotor control, causing longer pauses and compensatory arm drifts. This indicates challenges in processing visual information when the visual reference frame shifts during movement.

Area of Science:

  • Neuroscience
  • Human Motor Control
  • Virtual Reality

Background:

  • Reaching movements involve complex computations for target and limb localization.
  • Visuomotor control translates spatial information into motor commands for hand movement.

Purpose of the Study:

  • To investigate how visual field shifts impact visuomotor control during reaching.
  • To determine the effects of altered visuo-spatial relations on motor planning.

Main Methods:

  • Five healthy subjects performed reaching tasks in an immersive virtual environment.
  • Visual targets shifted unpredictably, and the virtual scene underwent roll motion.

Main Results:

  • A rolling visual field significantly increased pauses in reaching movements when targets shifted.

Related Experiment Videos

  • Terminal arm posture showed a drift opposite to the visual field's roll direction.

    • Conclusions:

    • Roll motion of the visual field impairs simultaneous processing of sequential visual stimuli.
    • Subjects compensated for perceived shifts in their visual reference frame during reaching.