Perturbation and nonlinear dynamic analysis of acoustic phonatory signal in Parkinsonian patients receiving deep brain stimulation.

Journal of Communication Disorders
Victoria S LeeJack J Jiang

Abstract

Nineteen PD patients who received deep brain stimulation (DBS), 10 non-surgical (control) PD patients, and 11 non-pathologic age- and gender-matched subjects performed sustained vowel phonations. The following acoustic measures were obtained on the sustained vowel phonations: correlation dimension (D2), percent jitter, percent shimmer, SNR, F0, vF0, and vAm. The results indicated the following: The mean D2 of control PD patients was significantly higher than the mean D2 of non-pathologic subjects and patients who received deep brain stimulation. These results suggest an improvement in PD voice in treated patients. Many PD vocal samples in this study have type 2 signals containing subharmonics that may not be suitable for perturbation analysis but are suitable for nonlinear dynamic analysis, making the D2 results more reliable. These findings show that DBS may provide measurable improvement in patients with severe vocal impairment. Readers will be able to: (1) identify the advantages of nonlinear dynamic analysis as a clinical tool to evaluate the aperiodic voice commonly found in patients with Parkinson's disease, (2) describe in general the method of obtaining a correlation dimension measure from a voice sample and the signifi...Continue Reading

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Citations

Dec 15, 2010·Clinical Neurology and Neurosurgery·István ValálikAndrás Csókay
Nov 12, 2015·Parkinson's Disease·Vincent Martel SauvageauJoël Macoir
Jan 20, 2017·Journal of Neural Transmission·L BrabenecIrena Rektorova
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May 19, 2021·Journal of the Neurological Sciences·Pawichaya SuphinnapongRoongroj Bhidayasiri

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