athetosis

More unusual is the rhythmical closing and opening of the hand, successively, of athetosis.

The differential diagnosis of athetosis is generally easily made.

Some degree of mental deficiency seems usually to accompany athetosis, even when uncomplicated by any other degenerating neurosis.

The silly, dancing, posturing, wiry movements, and the facial distortion observed in Huntington's chorea would hardly be mistaken by a careful observer for athetosis.