Abstract
Patients with cerebral damage were tested on three tasks requiring the performance of reversible operations in space. Damage to either the right or the left parietal lobes resulted in impairments on all three tasks; lesions in other cortical areas resulted in slight, if any, deficits. It is suggested that the inability to assume different perspectives in imagery underlies many of the impairments associated with parietal lobe damage, such as constructional apraxia and right-left disorientation.
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