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Paul C. Knox, Clifford R. Weir, Paul J. Murphy; Modification of Visually Guided Saccades by a Nonvisual Afferent Feedback Signal. Invest. Ophthalmol. Vis. Sci. 2000;41(9):2561-2565.
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purpose. To investigate the role of extraocular muscle afferent signals in the
control of saccadic eye movements.
methods. A suction scleral contact lens was used to impede the movements of the
right eye while subjects executed visually guided saccades to briefly
presented targets. Movements of the left eye were measured using
infrared oculography. Saccade amplitude, peak velocity, and duration
were analyzed trial by trial and compared before, during, and after the
right eye was impeded.
results. When the right eye was impeded, the amplitudes of saccades executed by
the left eye were reduced. There was no alteration in the main sequence
relationships. The amplitude effect had a rapid onset and offset. There
was no evidence that the effects built up over a number of trials, nor
was there evidence that individual saccades were modified on-line.
conclusions. These results are consistent with the hypothesis that extraocular
muscle afferent signals provide a feedback signal of the movements of
the eyes that is used to produce rapid adjustments of oculomotor output
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