International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 1999)

Florence, Italy
September 1-3, 1999

Application of Acoustic Speech Analysis in Amyotrophic Lateral Sclerosis Subjects

Barbara Tomik, Wieslaw Wszolek, Lidia Glodzik-Sobanska, Anna Lechwacka, Andrzej Szczudlik, Zbigniew Engel

Jagiellonian University, Collegium Medicum, Neurological Institute, Department of Neurology, Kraków, Poland

Assessment of dysarthria in ALS patients has not been fully studied. The aim of the study was to assess a typical dysarthria profile for different ALS group. 53 patients with definite (n=27) or probable (n=26) ALS (according to WFN criteria) were studied. Each patient had three acoustic, computer-analysed tests. The following consonants and vowels: "R", "L", "D", "T", "M", "W", "P", "B", "G","K","H", "Q", "O", "U", "T" were chosen for analysis. We used the Euclidian principle for analyses of sequences of sound formants and the mean sound distances from the pattern (Δf=125 Hz, ΔT=9 ms, Δs=0.5 dB). Our study showed the occurrence of characteristic dysarthria profile in different ALS groups ie. for bulbar group: "B", "O", "I", "W", "T" and for the limb group; "B", "I", "T", "W", "O" were the most deformed. We also demonstrated that preclinical dysarthric disorders occur among the ALS limb group. This study indicated a possibility of detecting and monitoring dysarthria in ALS based on acoustic speech analysis of changes in certain sounds.

Index Terms. acoustic speech analysis, dysarthria, ALS

Full Paper

Bibliographic reference.  Tomik, Barbara / Wszolek, Wieslaw / Glodzik-Sobanska, Lidia / Lechwacka, Anna / Szczudlik, Andrzej / Engel, Zbigniew (1999): "Application of acoustic speech analysis in amyotrophic lateral sclerosis subjects", In MAVEBA-1999, 86-91.