What is defined as the inability to respond to stimuli, make purposeful movements, or gain awareness of events taking place?

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Unconsciousness is defined as the inability to respond to stimuli, make purposeful movements, or gain awareness of events taking place. The causes of unconsciousness may result from diminished blood supply to the brain, altered quality of blood flow to the brain, CNS disorder, or emotional disturbance. In a dental setting, common causes are fear and anxiety.

What Is Defined as the Inability to Respond to Stimuli