A Superadditive-Impairment Theory of Optic Aphasia

Farah (1990) has proposed an alternative classof explanations involving partial damage to multiple pathways. Weexplore this explanation for optic aphasia, a disorder in which severe perfonnance deficits are observed when patients are asked to name visually presented objects, but surprisingly, performance is relatively nonnalon naming objects from auditory cues and on gesturing the appropriate use of visually presented objects.