There is an immediate effect on patients who have DBS on their motor function — the dyskinesia [involuntary muscle movements] is either gone or greatly reduced. (sciencedaily.com)
In that case, the skin cells became striatal medium spiny neurons, which are affected in Huntington's disease — an inherited, eventually fatal genetic disorder that causes involuntary muscle movements and cognitive decline beginning in middle adulthood. (sciencedaily.com)
Adverse effects of antipsychotic drugs include extrapyramidal symptoms, such as Parkinsonian involuntary muscle movement. (sciencedaily.com)