Marked abnormality of muscle tonus or behaviour including motor immobility, excessive and apparently purposeless motor activity, catalepsy or cerea flexibilitas, extreme negativism (1) or mutism, posturing or stereotyped movements, echolalia, or echopraxia. See catatonic disorder due to general medical condition, schizophrenia. catatonic adj. [From Greek kata down + tonos tension, from teinein to stretch + -ia indicating a condition or quality]
Subjects: Medicine and Health — Psychology.