The state of being unaware and unable to respond to surroundings, like being asleep but involuntarily, often due to injury or illness.
From 'un-' (not) plus 'consciousness,' from Latin 'conscientia' (knowing together). The prefix and root combine to mean literally 'not knowing.'
Unconsciousness fascinates neuroscientists because the brain doesn't simply turn 'off'—it's actively suppressing consciousness, as shown by studies of anesthesia, revealing that awareness is an active process!
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