Manual Activity During Speaking in Aphasic Subjects

Samples of free conversations were recorded in 6 normal and 12 aphasic subjects. Manual activity during speech was observed. Groups were shown to behave in an opposite way for the verbal and nonverbal measures: while aphasic subjects' verbal behavior is impaired, they produce more speech-related movements than normals. No differences appear concerning other movements (automanipulation, hand-to-hand posture, miscellaneous movements). Analysis of the aphasie group reveals no difference between the fluent and the nonfluent aphasies. Verbal fluency is shown to be a non-critical factor in the explanation of gesture production. Increased gestural production in aphasies may be interpreted according to the hypothesis that gestures are cues for the difficulties the speaker experiences in the verbal encoding process. On a recueilli des echantillons de conversation spontanee chez six sujets normaux et douze aphasiques. L'activite manuelle accompagnant la parole a ete analysee. Les groupes different en sens oppose selon les mesures, verbales ou non-verbales: perturbes dans leur comportement verbal, les aphasiques produisent plus de gestes que les sujets normaux. Aucune difference ne se manifeste en ce qui concerne les autres mouvements (automanipulation du visage, des mains et mouvements divers). L'analyse du groupe aphasique ne montre aucune difference entre les aphasiques fluents et non-fluents. La fluidite verbale ne parait donc pas constituer le facteur essentiel dans l'explication de la production gestuelle. L'augmentation de la gesticulation chez les aphasiques peut etre interpretee dans le cadre de l'hypothese selon laquelle les gestes sont des indices des difficultes que le locuteur eprouve dans les processus d'encodage verbal.

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