A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Consciousness lost and found: Subjective experiences in an unresponsive state
Tekijät: Noreika V, Jylhankangas L, Moro L, Valli K, Kaskinoro K, Aantaa R, Scheinin H, Revonsuo A
Kustantaja: ACADEMIC PRESS INC ELSEVIER SCIENCE
Julkaisuvuosi: 2011
Journal: Brain and Cognition
Tietokannassa oleva lehden nimi: BRAIN AND COGNITION
Lehden akronyymi: BRAIN COGNITION
Numero sarjassa: 3
Vuosikerta: 77
Numero: 3
Aloitussivu: 327
Lopetussivu: 334
Sivujen määrä: 8
ISSN: 0278-2626
DOI: https://doi.org/10.1016/j.bandc.2011.09.002
Tiivistelmä
Anesthetic-induced changes in the neural activity of the brain have been recently utilized as a research model to investigate the neural mechanisms of phenomenal consciousness. However, the anesthesiologic definition of consciousness as "responsiveness to the environment" seems to sidestep the possibility that an unresponsive individual may have subjective experiences. The aim of the present study was to analyze subjective reports in sessions where sedation and the loss of responsiveness were induced by dexmedetomidine, propofol, sevoflurane or xenon in a nonsurgical experimental setting. After regaining responsiveness, participants recalled subjective experiences in almost 60% of sessions. During dexmedetomidine sessions, subjective experiences were associated with shallower "depth of sedation" as measured by an electroencephalography-derived anesthesia depth monitor. Results confirm that subjective experiences may occur during clinically defined unresponsiveness, and that studies aiming to investigate phenomenal consciousness under sedative and anesthetic effects should control the subjective state of unresponsive participants with post-recovery interviews. (C) 2011 Elsevier Inc. All rights reserved.
Anesthetic-induced changes in the neural activity of the brain have been recently utilized as a research model to investigate the neural mechanisms of phenomenal consciousness. However, the anesthesiologic definition of consciousness as "responsiveness to the environment" seems to sidestep the possibility that an unresponsive individual may have subjective experiences. The aim of the present study was to analyze subjective reports in sessions where sedation and the loss of responsiveness were induced by dexmedetomidine, propofol, sevoflurane or xenon in a nonsurgical experimental setting. After regaining responsiveness, participants recalled subjective experiences in almost 60% of sessions. During dexmedetomidine sessions, subjective experiences were associated with shallower "depth of sedation" as measured by an electroencephalography-derived anesthesia depth monitor. Results confirm that subjective experiences may occur during clinically defined unresponsiveness, and that studies aiming to investigate phenomenal consciousness under sedative and anesthetic effects should control the subjective state of unresponsive participants with post-recovery interviews. (C) 2011 Elsevier Inc. All rights reserved.
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