A patient is immobile and mute, with no reaction to external stimuli. Before revealing the answer, decide what distinguishes psychiatric stupor from akinetic mutism.

Ask about the underlying level of consciousness, using whatever clinical evidence is available, rather than relying on the immobility and mutism alone, since these can look identical on the surface. Catatonic and depressive stupor, the most commonly encountered psychiatric forms, typically occur with clear consciousness despite the profound reduction in observable activity. Akinetic mutism, caused by lesions affecting the third ventricle, thalamus, or mid-brain, resembles stupor in its immobility and mutism but occurs together with a genuine, underlying lowering of consciousness, and points toward a specific organic cause requiring urgent neurological assessment rather than a psychiatric one.