"On-off" phenomena and manic-depressive mood shifts: case report

Area of Science:

• Neurology
• Psychiatry
• Neuroscience

Background:

• Idiopathic Parkinson's disease is a neurodegenerative disorder.
• Parkinson's disease is characterized by motor symptoms and
• on-off
• phenomena, which are fluctuations in motor control.

Observation:

• A single patient with idiopathic Parkinson's disease and
• on-off
• phenomena was studied.
• A direct correlation was observed between the patient's motor fluctuations and mood states.

Findings:

• The
• on
• (dyskinetic) phases of Parkinson's disease were consistently associated with manic episodes.
• The
• off
• (akinetic) phases were consistently associated with depressive episodes.

Implications:

• This case provides heuristic value in understanding the relationship between motor and affective symptoms.
• The findings indirectly support the dopamine hypothesis of affective disorders, suggesting dopamine plays a role in mood regulation.