Organic mental disorders in which there is impairment of the ability to maintain awareness of self and environment and to respond to environmental stimuli. Dysfunction of the cerebral hemispheres or brain stem RETICULAR FORMATION may result in this condition.

Synonyms: Consciousness, Level Altered, Semiconsciousness, Depressed Level of Consciousness, Consciousness Disorders, Consciousness, Level Depressed, Consciousness Disorder, Altered Level of Consciousness