Cognitive processing in non-communicative patients:what can event-related potentials tell us?


Event-related potentials (ERP) have been proposed to improve the differential diagnosis of non-responsive patients. We investigated the potential of the P300 as a reliable marker of conscious processing in patients with locked-in syndrome (LIS). Eleven chronic LIS patients and 10 healthy subjects (HS) listened to a complex-tone auditory oddball paradigm, first in a passive condition (listen to the sounds) and then in an active condition (counting the deviant tones). Seven out of nine HS displayed a P300 waveform in the passive condition and all in the active condition. HS showed statistically significant changes in peak and area amplitude between conditions. Three out of seven LIS patients showed the P3 waveform in the passive condition and five of seven in the active condition. No changes in peak amplitude and only a significant difference at one electrode in area amplitude were observed in this group between conditions. We conclude that, in spite of keeping full consciousness and intact or nearly intact cortical functions, compared to HS, LIS patients present less reliable results when testing with ERP, specifically in the passive condition. We thus strongly recommend applying ERP paradigms in an active condition when evaluating consciousness in non-responsive patients.

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Divisions: College of Health & Life Sciences
Additional Information: © 2016 Lugo, Quitadamo, Bianchi, Pellas, Veser, Lesenfants, Real, Herbert, Guger, Kotchoubey, Mattia, Kübler, Laureys and Noirhomme. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Uncontrolled Keywords: event-related potentials,locked-in syndrome,minimally conscious state,P300,unresponsive wakefulness syndrome,vegetative state,Neuropsychology and Physiological Psychology,Neurology,Psychiatry and Mental health,Biological Psychiatry,Behavioral Neuroscience
Publication ISSN: 1662-5161
Last Modified: 18 Jun 2024 07:15
Date Deposited: 06 Dec 2016 14:05
Full Text Link: http://journal. ... nhum.2016.00569
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2016-11-14
Accepted Date: 2016-10-26
Submitted Date: 2016-07-19
Authors: Lugo, Zulay R.
Quitadamo, Lucia R. (ORCID Profile 0000-0003-1877-4672)
Bianchi, Luigi
Pellas, Fréderic
Veser, Sandra
Lesenfants, Damien
Real, Ruben G.L.
Herbert, Cornelia
Guger, Christoph
Kotchoubey, Boris
Mattia, Donatella
Kübler, Andrea
Laureys, Steven
Noirhomme, Quentin



Version: Published Version

License: Creative Commons Attribution

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