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The human oculomotor response to simultaneous visual and physical movements at two different frequenciesIn order to investigate interactions in the visual and vestibular systems' oculomotor response to linear movement, we developed a two-frequency stimulation technique. Thirteen subjects lay on their backs and were oscillated sinusoidally along their z-axes at between 0.31 and 0.81 Hz. During the oscillation subjects viewed a large, high-contrast, visual pattern oscillating in the same direction as the physical motion but at a different, non-harmonically related frequency. The evoked eye movements were measured by video-oculography and spectrally analysed. We found significant signal level at the sum and difference frequencies as well as at other frequencies not present in either stimulus. The emergence of new frequencies indicates non-linear processing consistent with an agreement-detector system that have previously proposed.
Document ID
Document Type
Reprint (Version printed in journal)
Wall, C. (Harvard Medical School Massachusetts Eye and Ear Infirmary, 243 Charles St. Boston, MA 02114, United States)
Assad, A.
Aharon, G.
Dimitri, P. S.
Harris, L. R.
Date Acquired
August 21, 2013
Publication Date
January 1, 2001
Publication Information
Publication: Journal of vestibular research : equilibrium & orientation
Volume: 11
Issue: 2
ISSN: 0957-4271
Subject Category
Life Sciences (General)
Funding Number(s)
Distribution Limits
NASA Discipline Neuroscience
Non-NASA Center