Visuomotor integration in split-brain monkeys with other cerebral lesions.

Split-brain monkeys underwent either deep hemispheric disconnection or unilateral cortical ablations in an attempt to determine the neural mechanisms underlying ipsilateral eye-hand coordination. The results indicate that the responding hand is not in any direct way controlled by visual processes of the ipsilateral hemisphere. Instead, it is suggested that the target information crosses over to the hemisphere in major control of the responding arm through proprioceptive feedback generated during eye, head and neck movements initiated by the hemisphere viewing the target.