General view Parkinson’s disease is a degenerative brain condition associated with motor symptoms (slowness of movement, tremors, stiffness, gait disturbances, and imbalance) and a wide variety of non-motor complications (cognitive decline, mental disorders, sleep disorders, and pain and other sensory disturbances). Motor impairments such as dyskinesias (involuntary movements) and dystonias (involuntary and painful muscle contractions) lead to limited speech, mobility, and...