any of various distortions of voluntary movement (dyskinesias), such as tremors, spasms, tics, rigidity, or gait disturbances, associated with some lesion of the extrapyramidal tract. These dyskinesias can occur in neurological disorders or as a side effect of antipsychotic drugs, which produce such conditions as akathisia, acute dystonia, and tardive dyskinesia.
increased cognitive and physiological arousal before a competition. Precompetition anxiety may facilitate or inhibit performance, depending on the performer’s perception of readiness or apprehension. See debilitative anxiety; facilitative anxiety.