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Speech Intelligibility During Clinical and Low Frequency.

John J Sidtis^1,2, Diana Van Lancker Sidtis^1,3, Ritesh Ramdhani⁴

¹Brain and Behavior Laboratory, Geriatrics Division, the Nathan Kline Institute, 140 Old Orangeberg Road, Building 35, Orangeburg, NY 10962, USA.

|January 8, 2020

Summary

This summary is machine-generated.

Deep brain stimulation (DBS) for Parkinson's disease (PD) can reduce speech intelligibility. Subthalamic nucleus DBS negatively impacts voice and articulation, with no clear benefit from lower stimulation frequencies.

Keywords:

Parkinson’s disease articulation deep brain stimulation speech voice

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Area of Science:

Neurology
Speech-Language Pathology
Biomedical Engineering

Background:

Subthalamic nucleus deep brain stimulation (STN-DBS) is a common Parkinson's disease (PD) treatment.
STN-DBS effects on speech are inconsistent across studies.
Optimal stimulation parameters for speech are not well-defined.

Purpose of the Study:

To investigate the impact of different STN-DBS stimulation frequencies on spontaneous speech intelligibility and quality.
To compare low-frequency stimulation (LFS) with high-frequency stimulation (HFS) in PD patients.
To determine if LFS improves speech outcomes compared to HFS or no stimulation.

Main Methods:

Seven PD patients with bilateral STN-DBS were assessed off medication.
Spontaneous speech was recorded under three conditions: stimulators off, LFS (60 Hz), and HFS (185 Hz).
Speech intelligibility, voice quality, articulation, fluency, and rate were perceptually and acoustically evaluated.

Main Results:

Speech intelligibility decreased significantly at both LFS and HFS compared to DBS off.
HFS resulted in slightly better intelligibility than LFS, but increased subjective task difficulty.
Voice and articulation abnormalities worsened with active STN-DBS, with voice changes correlating with intelligibility.

Conclusions:

STN-DBS reduces spontaneous speech intelligibility in PD patients at both tested frequencies.
Lowering stimulation frequency (LFS) did not improve intelligibility and may worsen articulation.
Perceived voice changes during STN-DBS appear more indicative of intelligibility changes than articulation changes.