Distorsions de l'espace vocalique : quelles mesures? Application à la dysarthrie (Distortions of vocalic space: which measurements? An application to dysarthria.) [in French]

________________________________________________________________________________________________________________ Distortions of vocalic space: which measurements? An application to dysarthria. This paper presents several metrics derived from F1/F2 measurements for the description and quantification of the possible variations to be observed in a vocalic space. 8 metrics from the literature or adapted to our data are evaluated on productions of the vowels /a, e, i, u, o/, extracted from a text read by 78 dysarthric patients suffering from Parkinson disease, cerebellar syndrome or ASL, and by 26 healthy control speakers. The ability of the metrics to describe vocalic space alterations associated with the different dysarthria as compared with the control group is studied. The relations between the metrics and with perceived intelligibility of the patients are also discussed. Results outline the necessity to consider several metrics to account for the multidimensionality of the alteration possible in a vocalic space. MOTS-CLÉS : dysarthrie, espace vocalique acoustique, réduction, centralisation, Parkinson, Syndrome cérébelleux, Sclérose Latérale Amyotrophique