Accuracy of eye position information for motor control

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Abstract

Two dimensional eye movements were recorded to show that subjects could return their eyes to a reference position following both saccades and slow phase of vestibular nystagmus suggesting eye position was signalled accurately during both movement types and this signal was closely timelocked to saccades. In addition, this signal could be used by naive subjects for oculomotor control without special training. Finally, subjects could strike blows within a few minutes of arc of a target localized only by eye position information suggesting both that motor systems detect eye position to better than 0.5° arc and that large errors in controlling eye position in the dark could be attributed to poor spatial memory.

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This research was supported by Research Grants EY 01049 from the National Eye Institute and BMS 75-18181 from the National Science Foundation to A. A. Skavenski.

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