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Related Experiment Videos

Prolonged optokinetic stimulation generates podokinetic after rotation.

Carlos R Gordon1, Dror Tal, Natan Gadoth

  • 1Department of Neurology, Meir General Hospital, Kfar Saba and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel. cgordon@post.tau.ac.il

Annals of the New York Academy of Sciences
|December 10, 2003
PubMed
Summary

Prolonged optokinetic stimulation (OK) alone can induce an after-rotation effect in blindfolded individuals stepping in place. This phenomenon, termed optokinetically induced podokinetic after-rotation (oPKAR), demonstrates novel neural interactions and adaptive plasticity.

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Area of Science:

  • Neuroscience
  • Vestibular System
  • Human Motor Control

Background:

  • Previous research established podokinetic after-rotation (PKAR) following prolonged stepping on a rotating platform.
  • PKAR involves self-rotation without perceptual awareness, suggesting a link between visual and motor systems.
  • The potential for optokinetic stimulation (OK) alone to induce similar after-effects remained unexplored.

Purpose of the Study:

  • To investigate whether prolonged optokinetic stimulation (OK) can elicit podokinetic (PK) responses.
  • To characterize the phenomenon of optokinetically induced podokinetic after-rotation (oPKAR).

Main Methods:

  • Ten healthy subjects underwent a control stepping test.
  • Subjects were exposed to 30 minutes of whole-visual-field OK (45°/s) in a circular cage.

Related Experiment Videos

  • Following OK, blindfolded subjects attempted to step in place on a stationary floor for 30 minutes.

    • Main Results:

    • All subjects exhibited self-rotation relative to space during stepping after OK, without perceiving movement (oPKAR).
    • The direction of oPKAR was consistently opposite to the direction of the preceding OK.
    • Peak oPKAR velocity (mean 7.8°/s) was reached around 6 minutes, followed by a decay with a time constant of approximately 42 minutes.

    Conclusions:

    • Prolonged optokinetic stimulation (OK) is sufficient to induce optokinetically induced podokinetic after-rotation (oPKAR).
    • This suggests OK charges a neural storage element for podomotor activity with a long time constant.
    • The findings highlight novel neural interactions and adaptive plasticity, potentially relevant for vestibular and parietal lobe disorders.