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Loudness perception and speech intensity control in Parkinson's disease
Jenna P Clark1, Scott G Adams2, Allyson D Dykstra1
1School of Communication Sciences and Disorders, Western University, London, Ontario, Canada N6G 1H1; Health and Rehabilitation Sciences Program, Western University, London, Ontario, Canada N6G 1H1.
Journal of Communication Disorders
|September 8, 2014
Summary
Individuals with Parkinson's disease (PD) and hypophonia show impaired loudness perception. This study found PD patients have abnormal perception of both external and self-generated speech intensity.
Area of Science:
- Neurology
- Speech-Language Pathology
Background:
- Hypophonia, characterized by reduced loudness, is a common symptom in Parkinson's disease (PD).
- Understanding speech loudness perception deficits in PD is crucial for developing effective therapeutic interventions.
Purpose of the Study:
- To investigate speech loudness perception in individuals with hypophonia associated with Parkinson's disease.
- To compare loudness perception abilities between individuals with PD and healthy controls.
Main Methods:
- 17 individuals with PD and 25 age-matched controls participated.
- Three tasks assessed loudness perception: magnitude estimation, imitation, and magnitude production of speech.
- Stimuli involved sentences spoken at varying sound pressure levels (60-80 dB SPL) and self-generated loudness levels.
Main Results:
- Participants with PD exhibited significantly different loudness perception patterns compared to controls.
- Individuals with PD used a more restricted range in perceiving and producing speech loudness.
- Deficits were observed in perception of external speech, imitation of intensity, and self-estimated loudness.
Conclusions:
- Parkinson's disease is associated with a deficit in speech loudness perception.
- This deficit affects the abnormal perception of both externally generated and self-generated speech intensity.
- Findings highlight the need for targeted speech therapy addressing loudness perception in PD.
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