Saccades and Finger Movements Are Planned Using Visual Memory As Well As Current Retinal Information


It has been shown that in planning hand movements, memory is integrated with current visual input, based on their relative reliabilities. We present a similar result for planning eye movements in a natural task with no explicit memory requirement. Our virtual task involved moving a "weapon" to a "reload station" 15 or 30 degrees of visual angle to the left, then back to a circular target on the right. In 33% of trials, the circular target jumped by 1 degree while subjects moved to the reload station. Visual memory significantly influenced the motor plans for both hand and eye, and the significantly increased weight to memory in the far condition suggests that visual memory is integrated with on-line signals in proportion to their relative reliabilities. While the weight to memory is similar for the eye and finger, within-subject weight estimates were too uncertain to test the same-internal estimate model.

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