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The hypothesis that hemispheric asymmetries for visuo-spatial ability exist in rhesus monkeys was tested using a task for which the right hemisphere is specialized in man. The task required discrimination between two squares, one containing a central dot and the other a dot displaced upwards from centre. The animals' thresholds were determined before and after left-sided (LH-lesion) or right-sided (RH-lesion) unilateral occipital lobectomy combined with splenial transection, and the percentage change in threshold calculated. The LH-lesion monkeys were all worse than the RH-lesion monkeys on this measure, indicating the existence of a functional asymmetry.

Original publication




Journal article



Publication Date





777 - 784


Animals, Corpus Callosum, Discrimination Learning, Dominance, Cerebral, Form Perception, Functional Laterality, Macaca mulatta, Male, Occipital Lobe, Orientation, Pattern Recognition, Visual, Psychomotor Performance, Sensory Thresholds, Space Perception