Abstract
Objective measurement of human vertical fusional response was carried out using a binocular eye movement monitoring device. The dichoptic stimulus consisted of a single horizontal line subtending 8.5°. The maximum fusible vertical disparity that could be introduced in a single step was 53.2′. The results indicate the presence of a predominant motor component and a small but significant central component in vertical fusional response. Approximately 8 sec were required for the completion of the motor response to a step disparity. Thus, the observed vertical disjunctive movements were roughly 8 times slower than horizontal disjunctive movements. Furthermore, while horizontal disjunctive movements were found to be symmetrical and in accordance with Hering's Law of Equal Innervation, vertical disjunctive movements were found to be unsymmetrical, both in their time course and in their final contributions to the overall motor response.
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