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levels of consciousness
an early freudian concept referring to the conscious, preconscious, and unconscious.
the loosely defined states of awareness of and response to stimuli, often an integral component of the assessment of an individual's
neurologic status. Levels of consciousness range from full consciousness (behavioral wakefulness, orientation as to time, place, and person, and a capacity to respond appropriately to stimuli) to deep coma (complete absence of response).

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