Effet de l’accélération artificielle du signal de parole sur la perception des dysarthries cérébelleuses: à propos de deux cas

Abstract

vement plus grande pour la condition VI ou VM que pour la condition VN. Le passage de la condition VN à la condition VI augmente le taux de satisfaction des auditeurs quant à l'intelligibilité de 78 à 87% pour Mme B et de 46 à 63% pour Mme Z. Les erreurs sont moins fréquentes avec la compression pour Mme Z. L'effet de l'accéléra-tion n'est jamais significatif sur les temps de réaction (F 2, 1024 = 2,14, p = 0,12). Conclusions: Cette étude est la première à analyser l'effet d'une accélération temporelle uniforme sur de la parole pathologique. Elle montre que chez 2 patientes présentant une dysarthrie ataxique, le niveau perçu de l'intelligibilité est amélioré. The Effect of Time-Compressed Speech on the Perception of Ataxic Dysarthria: A Report of Two CasesAim: In cerebellar dysarthria, the lack of precision in the articulatory motions leads to a temporal dysregulation with a decreased rate of speech. That is, our hypothesis is that the signal distortions are linked to the slowness of speech and that the acceleration of the rate improves the intelligibility of speech. Patients and Method: Two patients with a cerebellar pathology and an ataxic dysarthria participated in the present study. Speech intelligibility was assessed subjectively by a visual analog scale, and objectively by the constant-stimulus method associated with an identification task of a target phoneme in real time. The SOLA algorithm was used to accelerate the speech stimuli. 144 test sentences were created at 3 speed rates: 48 sentences at 'natural speed' (without compression, VN), 48 sentences at 'intermediate speed' (50% of the maximum rate, VI) and 48 sentences at 'maximum speed' (mean rate of a control group of speakers, VM). The 144 test sentences, in 3 experimental conditions, were distributed over 3 lists, each listener hearing each sentence only once; 8 subjects were assigned to each list. The sentences were presented in random order. A subjective assessment was performed