Quantitative Assessment of Syllabic Timing Deficits in Ataxic Dysarthria

Abstract

Parametric analysis of Cerebellar Dysarthria (CD) may be valuable and more informative compared to its clinical assessment. A quantifiable estimation of the timing deficits in repeated syllabic utterance is described in the current study. Thirty-five individuals were diagnosed with cerebellar ataxia to varying degrees and twenty-six age-matched healthy controls were recruited. To automatically detect the local maxima of each syllable in the recorded speech files, a topographic prominence incorporated concept is designed. Subsequently, four acoustic features and eight corresponding parametric measurements are extracted to identify articulatory deficits in ataxic dysarthria. A comparative study on the behaviour of these measures for dysarthric and non-dysarthric subjects is presented in this paper. The results are further explored using a dimensionreduction tool (Principal Component Analysis) to emphasize variation and bring out the strongest discriminating patterns in our feature dataset.