FURTHER EVIDENCE OF A DISSOCIATION BETWEEN OUTPUT PHONOLOGICAL AND ORTHOGRAPHIC LEXICONS - A CASE-STUDY

We describe a patient who is significantly better at written picture n aming than at spoken picture naming. His difficulty in oral production is argued to result from damage to lexical-phonological output proces sing, suggesting that activation of lexical-phonological output is not necessary to support writing. Nor can his writing be supported by pho neme-to-grapheme conversion rules, as evidenced by a complete inabilit y to write nonwords to dictation. In addition, his reading comprehensi on appears to be independent of phonological mediation, due to severel y impaired phoneme-to-grapheme conversion abilities and impaired under standing of aurally presented words when these words are presented wit hout supporting context. It is argued that writing and reading compreh ension do not require the generation of a phonological representation.