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To quantify aperiodic phonation, nonlinear dynamic methods of acoustic voice analysis, such as correlation dimension, have been shown to be useful. The purpose of this study is to evaluate the validity of nonlinear dynamic analysis as a voice analysis tool for the effects of deep brain stimulation (DBS) and levodopa on patients with Parkinson's disease (PD).

folia phoniatrica et logopaedica

Evaluation of the Effects of Deep Brain Stimulation of the Subthalamic Nucleus and Levodopa Treatment on Parkinsonian Voice Using Perturbation, Nonlinear Dynamic, and Perceptual Analysis