Studies have also shown a progression of dysprosody over time in patients with Parkinson's disease. Abnormalities in speech rate, pauses, and variation range in speech become worse as the condition progresses. The degradation of prosody in Parkinson's disease over time is independent of motor control issues, and is thus separate from those aspects of the condition. Studies have shown that treatment for Parkinson's disease can help with the dysprosody symptoms, however there is usually an improvement in pitch control only and not in the volume and emotional aspects of the condition. These treatments include medications such as L-DOPA as well as electrophysiological treatments.