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The Journal of Neurophysiology Vol. 81 No. 2 February 1999, pp. 596-610
Copyright ©1999 by the American Physiological Society
Department of Neurology, Department of Brain and Cognitive Sciences, Department of Neurobiology and Anatomy, Department of Ophthalmology, and The Center for Visual Science, The University of Rochester Medical Center, Rochester, New York 14642
MST neuronal responses to heading direction during pursuit eye
movements. As you move through the environment, you see a
radial pattern of visual motion with a focus of expansion (FOE) that indicates your heading direction. When self-movement is combined with
smooth pursuit eye movements, the turning of the eye distorts the
retinal image of the FOE but somehow you still can perceive heading. We
studied neurons in the medial superior temporal area (MST) of monkey
visual cortex, recording responses to FOE stimuli presented during
fixation and smooth pursuit eye movements. Almost all neurons showed
significant changes in their FOE selective responses during pursuit eye
movements. However, the vector average of all the neuronal responses
indicated the direction of the FOE during both fixation and pursuit.
Furthermore, the amplitude of the net vector increased with increasing
FOE eccentricity. We conclude that neuronal population encoding in MST
might contribute to pursuit-tolerant heading perception.
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