Cross-cuing mechanisms and ipsilateral eye-hand control in split-brain monkeys.

It was proposed that split-brain monkeys are able to perform ipsilateral eyehand response because the seeing hemisphere can cross-cue the blind hemisphere, which is in major motor control of the arm, by orienting toward a point in space and, thereby, allow for the bilateral registration of head, neck, and eye position. In the present study, accuracy of ipsilateral eye-hand response was measured in normal and split-brain animals under conditions of free and restrained head movement. The results confirm the view that split-brain monkeys rely on cross-cuing information in order to maintain this kind of behavioral unity.