Extended High-Frequency Hearing Thresholds and Categorical Loudness Scaling in Parkinson's Disease

The relative lack of differences between the PD and control groups in their hearing abilities may reflect the relatively mild severity of the disease in this sample. However, the observed relationship between motor symptom severity and hearing thresholds suggests that PD severity may be associated with a decline in hearing ability that warrants further investigation and clinical monitoring in conjunction with other PD symptoms.