Vocal Analysis of Individuals with Parkinson's Disease: Correlations between Perceptual Data, Acoustics and Electroglottography

Author(s): Tamiris Akbart, Carolina Anhoque and Alexsandro Meireles


The purpose of this study was to investigate the data of perceptual voice assessment, acoustics and eletroglottography in individuals with Parkinson’s Disease (PD). 20 patients of both genders participated, with PD diagnosis at stages 2 and 3 of the Hoehn & Yahr scale (case group). The comparative control group also consisted of 20 individuals without PD or any other neurological disorder and with vocals indicative of their sex and age. The audio-perceptual evaluation was performed consensually by two evaluators, classifying the voices by their degree of deviation from the international GRBASI scale. The extracted acoustic parameters were: fundamental frequency (F0), intensity, harmony-noise ratio (HNR), jitter and shimmer. The electroglottographic waves were qualitatively analyzed using seven parameters. There were differences between the groups in the international degree of deviation (p < 0.0001) and there were positive and negative correlations between the deviation of the overall grade and variable acoustics and electroglottographic analysis. It was concluded that the integrated use of these three tools exhibited variables that permitted the differentiation of vocal markers resulting from DP comparison with the control group, which, in turn, helped the clinical and physiological reasoning of the voices of patients with PD classification of voice disorders.