A search for the source within the right hemisphere of its primacy on tests of figural matching was made. Patients with right and left hemisphere damage were studied and comparison was made of response to a shape matching task flashed to the right or the left hemisphere. When the right hemisphere is damaged performance seriously declines whether the patient is tested on the right or the left hemisphere. Studies of the specific location within the right hemisphere indicated widespread but subtotal involvement implicating the frontal, temporal and parietal regions of this hemisphere.
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