Electropalatographic study of speech sound errors in adults with acquired aphasia
Traditionally speech errors in adults with acquired aphasia have been described as either apraxic errors, characteristic of anterior lesions in the cerebral cortex affecting areas such as Broca's area, or phonemic paraphasic errors due to posterior lesions in areas such as Wernicke's area. However, studies have reported overlap in the descriptions of apraxic and phonemic paraphasic errors despite the assumption that these errors arise from different levels in the speech planning and execution process. For example, phonemic substitutions are associated with both types of error. Part of the problem is due to difficulties in identifying the precise nature and source of the errors which cannot be resolved by auditory perceptual judgements alone. This study investigates, by means of elcctropalatography (EPG), the location and timing of contact patterns produced by ten adults with acquired aphasia. The subjects were variously diagnosed by traditional classification as Broca's aphasic with or without apraxia, conduction and anomic. These subjects variously demonstrated atypical patterns when compared to ten control speakers such as: increased temporal and/or spatial variability; specific difficulties in the sequencing
Wood, Sara Elizabeth
Speech therapy; Speech disorders
Electropalatographic study of speech sound errors in adults with acquired aphasia. Traditionally speech errors in adults with acquired aphasia have been described as either apraxic errors, characteristic of anterior lesions in the cerebral cortex affecting areas such as Broca's area, or phonemic paraphasic errors due to posterior lesions in areas such as Wernicke's area. However, studies have reported overlap in the descriptions of apraxic and phonemic paraphasic errors despite the assumption that these errors arise from different levels in the speech planning and execution process. For example, phonemic substitutions are associated with both types of error. Part of the problem is due to difficulties in identifying the precise nature and source of the errors which cannot be resolved by auditory perceptual judgements alone. This study investigates, by means of elcctropalatography (EPG), the location and timing of contact patterns produced by ten adults with acquired aphasia. The subjects were variously diagnosed by traditional classification as Broca's aphasic with or without apraxia, conduction and anomic. These subjects variously demonstrated atypical patterns when compared to ten control speakers such as: increased temporal and/or spatial variability; specific difficulties in the sequencing
study speech_sound error adult acquire aphasia traditionally speech_error adult acquire aphasia describe either error characteristic anterior lesion cerebral affect area area phonemic error due posterior lesion area area however study_report overlap description phonemic error despite assumption error arise different_level speech plan execution process example phonemic substitution associate type error part problem due_difficulty identify precise_nature source error resolve auditory perceptual judgement alone study_investigates mean location timing contact pattern produce adult acquire aphasia subject variously diagnose traditional_classification aphasic without subject variously demonstrate atypical pattern_compare control speaker increased temporal and spatial variability specific difficulty sequence