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Related Experiment Videos

Reaching during virtual rotation: context specific compensations for expected coriolis forces.

J V Cohn1, P DiZio, J R Lackner

  • 1Ashton Graybiel Spatial Orientation Laboratory and Volen Center for Complex Systems, Brandeis University, Waltham, Massachusetts 02454-9110, USA.

Journal of Neurophysiology
|June 10, 2000
PubMed
Summary
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The nervous system automatically compensates for Coriolis forces during reaching movements, even when rotation is illusory. This demonstrates context-specific motor planning for self-generated accelerative loads.

Area of Science:

  • Neuroscience
  • Motor Control
  • Human Perception

Background:

  • Subjects in rotating environments experience Coriolis forces affecting reaching accuracy.
  • Voluntary torso rotation appears to allow for accurate reaching, suggesting motor plan adaptations.
  • The motor system may use body motion representations to predict and compensate for self-generated forces.

Purpose of the Study:

  • To investigate if the nervous system compensates for Coriolis forces during visually perceived self-rotation.
  • To determine if reaching errors occur in the absence of actual rotation but with illusory self-motion.
  • To examine the context-specific nature of motor compensation for Coriolis forces.

Main Methods:

  • Four experiments involving visually open-loop reaching tasks to targets.
Keywords:
NASA Discipline NeuroscienceNASA Program Biomedical Research and CountermeasuresNon-NASA Center

Related Experiment Videos

  • Induction of illusory self-rotation and displacement using a rotating visual scene.
  • Analysis of reaching paths and endpoints during perceived rotation and after removal of the stimulus.

    • Main Results:

    • Subjects made significant reaching errors, with displacements opposite to expected Coriolis forces during illusory rotation.
    • Reaching errors (path curvature and endpoint deviation) increased with the speed of illusory rotation.
    • Movement accuracy improved with successive reaches, and no aftereffects were observed upon returning to a stationary scene.

    Conclusions:

    • The nervous system automatically compensates for Coriolis forces during reaching movements in a context-specific manner.
    • Motor plans adapt to perceived body motion, even when it is illusory, to maintain reaching accuracy.
    • This compensation is automatic and specific to the perceived context, disappearing when the context is removed.