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Anesthesia and sleep have surprisingly similar effects on brain activity, finds study What happens in the brain when our conscious awareness fades during general anesthesia and normal sleep? Finnish scientists studied this question with novel experimental designs and functional brain imaging. They succeeded in separating the specific changes related to consciousness from the more widespread overall effects, and discovered that the effects of anesthesia and sleep on brain activity were surprisingly similar. These novel findings point to a common central core brain network fundamental for human consciousness. Explaining the biological basis of human consciousness is one of the greatest challenges of science. While the loss and return of consciousness, as regulated by drugs or physiological sleep, have been employed as model systems in the study of human consciousness, previous research results have been confounded by many experimental simplifications.

United statesMichael alkireAntti revonsuoHarry scheininAnnalotta scheininEmily hendersonUniversity of californiaFinnish national research instituteRapid eye movementTurku university hospitalAatos erkko foundationAkademi universityUniversity of turkuAcademy of finlandPrincipal investigatorNon rapid eye movement