Tic disorders are conditions featuring sudden, non-rhythmic movements or vocalizations. A formal tic disorder diagnosis is determined by tic frequency, duration, and type. Tics are non-rhythmic ...

Chronic motor tic disorder is a condition that involves brief, uncontrollable, spasm-like movements or vocal outbursts (called phonic tics), but not both. If both a physical tic and vocal outburst are ...