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Single word production in nonfluent progressive aphasia.
Authors:
Croot, K., Patterson, K. & Hodges, J.R.
Reference:
Brain and Language, 61, 226-273.
Year of publication:
1998
CBU number:
3496
Abstract:
We present an experimental investigation of the spoken single word production of two patients with non-fluent progressive aphasia. In Experiment 1, a task effect (reading > repetition > naming) suggested that phonological information available from task stimuli facilitated the patients' speech production; a length effect reflected the increased difficulty of phonological processing required for long words compared with shorter words. Experiment 2 compared repetition, reading, copying and writing to dictation tasks and demonstrated that a correspondence between input and output modality also facilitated performance. Experiment 3 showed that the patients' access to appropriate phonology in reading was positively related to the degree of correlation between orthographic and phonological forms. These results are discussed with reference to an account of pathologically weakened connections between nodes in an interactive spreading activation model of speech production of the type described by Dell (1986).