Unconsciousness

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List of terms related to Unconsciousness

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: LOC: non responsive; unresponsive; non-responsive; non-responsiveness; unresponsiveness; lack of responsiveness

Overview

Unconsciousness, more appropriately referred to as loss of consciousness or lack of consciousness, is a dramatic alteration of mental state that involves complete or near-complete lack of responsiveness to people and other environmental stimuli.

Causes

• Alcohol
• Brownout or greyout, a partial loss of consciousness
• Cardiac arrest
• Coma
• Fainting
• Fatigue
• Hypnotic drugs
• Sedatives
• Shallow water blackout
• Stroke
• Syncope
• Traumatic brain injury

Differentiating Loss of Consciousness from other Disorders

• Loss of consciousness should not be confused with the notion of the psychoanalytic unconscious or cognitive processes (e.g., implicit cognition) that take place outside of awareness. Loss of consciousness must not be confused with altered states of consciousness, such as delirium (when the person is confused and only partially responsive to the environment), normal sleep, hypnosis, and other altered states in which the person responds to stimuli.

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