Abnormal diminished volition Akinetic mutism 2014-02-27T10:50:59Z SNOMEDCT_US:53333005 HP:0012672 Akinetic mutism is essentially characterized by a total absence of spontaneous behavior and speech occurring in the presence of preserved visual tracking. Stuporous mutism UMLS:C0001889 The combined absence of spontaneous movement (akinesia) and speech (mutism). There may be eye movements consistent with visual tracking and the person may remember the events occurring at the time of the experience of stupor.