ABSTRACT
Hyperkinetic movement disorders are classified according to the phenomenology of the movements into the following categories: • Dystonia: sustained twisting repetitive movements
and posturing. • Tremor: rhythmic, sinusoidal oscillation. • Athetosis (‘without fixed position’): slow writhing of
distal limbs and fingers. • Chorea: random flowing movements from one body
part to another. • Myoclonus: brief, abrupt shock-like jerking
movements. • Tics: repetitive simple or complex movements,
suppressed by an effort of will. • Stereotypies: complex coordinated motor behaviours
repeated at the expense of other activities.
