In this paper we report some clinical data relevant to the issue of whether or not words are decomposed into their constituent morphemes prior to lexical access during reading. The data were obtained from a crossed phonological dyslexic patient who produced many derivational errors in reading aloud. The experimental investigation consisted of a series of tests requiring either reading words and non-words aloud or lexical decision tasks. The results are interpreted as supporting decomposition models of lexical access. In particular, a revised version of the logogen model—which postulates visual recognizers for affixes—seems to fit the data very well.
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