[…] characterized by abrupt, repetitive, stereotyped and involuntary movements (motor tics) or sounds (phonic tics).
[omicsonline.org]
The amplitude of involuntary movements may range from a mere sense of electric shock to minimal twitchings to violent movements of the limbs.
[symptoma.com]
They are characterized by single or repetitive, bilateral, abrupt, symmetric, arrhythmic, involuntary movements, predominantly involving the shoulders and arms; however, they
[scielo.br]