Rapid word identification in pure alexia is lexical but not semantic.
Following the notion that patients with pure alexia have access to two distinct reading strategies-letter-by-letter reading and semantic reading-a training program was devised to facilitate reading via semantics in a patient with pure alexia. Training utilized brief stimulus presentations and required category judgments rather than explicit word identification. The training was successful for trained words, but generalized poorly to untrained words. Additional studies involving oral reading of nouns and of functors also resulted in improved reading of trained words. Pseudowords could not be trained to criterion. The results suggest that improved reading can be achieved in pure alexia by pairing rapidly presented words with feedback. Focusing on semantic processing is not essential to this process. It is proposed that the training strengthens connections between the output of visual processing and preexisting orthographic representations.
Friedman
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RB
Department of Neurology, Georgetown University Medical Center, National Rehabilitation Hospital Research Center, Washington, DC 20007, USA. rbf@giccs.georgetown.edu
Lott
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SN
D004410:Dyslexia / Q000175:diagnosis* / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012660:Semantics; D014825:Vocabulary