PRESERVED IMAGERY FOR COLORS IN A PATIENT WITH CEREBRAL ACHROMATOPSIA

We report the case of a patient who, after sequential bilateral stroke s in the occipital regions sparing the primary visual cortex, develope d a severe deficit of colour perception. At variance with other report s of acquired achromatopsic patients, she showed a perfectly vivid vis ual imagery for colours. These findings, together with similar data in domains other than colour processing, challenge the theories which po sit that the same cognitive processes are involved in both the percept ion and the retrieval from memory of a given stimulus.