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ERIC Number: EJ947405
Record Type: Journal
Publication Date: 2011-Dec
Pages: 8
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0278-2626
Consciousness Lost and Found: Subjective Experiences in an Unresponsive State
Noreika, Valdas; Jylhankangas, Leila; Moro, Levente; Valli, Katja; Kaskinoro, Kimmo; Aantaa, Riku; Scheinin, Harry; Revonsuo, Antti
Brain and Cognition, v77 n3 p327-334 Dec 2011
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. (Contains 4 tables, 1 figure and 1 supplementary data.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A