involuntary movements that are slower, coarser and more writhing than choreaic movements
characteristic position of the hand is marked flexion of the wrist, flexion of the metacarpophalangeal joints and extension at IPJ this posture is disturbed by slow writhing movements of flexion and extension at the wrist and of different amounts of adduction and abduction. May also get movements at elbow and shoulder
movements in lower limb are usually less severe – foot is usually maintained in a plantarflexed and inverted position with the hallux dorsiflexed; can get repetitive plantarflexion and dorsiflexion of toes in an irregular fashion.
movements are exaggerated by attempts at voluntary movement – also by nervousness and excitement
disappear during sleep
eg cerebral palsy, Wilson’s disease, juvenile Huntington’s chorea, following cerebral anoxia