Article (Scientific journals)
When thoughts become action: An fMRI paradigm to study volitional brain activity in non-communicative brain injured patients
Boly, Mélanie; Coleman, M. R.; Davis, M. H. et al.
2007In NeuroImage, 36 (3), p. 979-992
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Abstract :
[en] The assessment of voluntary behavior in non-communicative brain injured patients is often challenging due to the existence of profound motor impairment. In the absence of a full understanding of the neural correlates of consciousness, even a normal activation in response to passive sensory stimulation cannot be considered as proof of the presence of awareness in these patients. In contrast, predicted activation in response to the instruction to perform a mental imagery task would provide evidence of voluntary task-dependent brain activity, and hence of consciousness, in non-communicative patients. However, no data yet exist to indicate which imagery instructions would yield reliable single subject activation. The aim of the present study was to establish such a paradigm in healthy volunteers. Two exploratory experiments evaluated the reproducibility of individual brain activation elicited by four distinct mental imagery tasks. The two most robust mental imagery tasks were found to be spatial navigation and motor imagery. In a third experiment, where these two tasks were directly compared, differentiation of each task from one another and from rest periods was assessed blindly using a priori criteria and was correct for every volunteer. The spatial navigation and motor imagery tasks described here permit the identification of volitional brain activation at the single subject level, without a motor response. Volunteer as well as patient data [Owen, A. M., Coleman, M.R., Boly, M., Davis, M.H., Laureys, S., Pickard J.D., 2006. Detecting awareness in the vegetative state. Science 313, 1402] strongly suggest that this' paradigm may provide a method for assessing the presence of volitional brain activity, and thus of consciousness, in non-communicative brain-injured patients. (c) 2007 Elsevier Inc. All rights reserved.
Disciplines :
Radiology, nuclear medicine & imaging
Neurosciences & behavior
Author, co-author :
Boly, Mélanie ;  Université de Liège - ULiège > Centre de Recherches du Cyclotron - Comagroup > Neurologie
Coleman, M. R.;  University of Cambridge
Davis, M. H.;  MRC Cognition and Brain Sciences Unit,
Hampshire, A.;  MRC Cognition and Brain Sciences Unit,
Bor, D.;  MRC Cognition and Brain Sciences Unit,
Moonen, Gustave  ;  Université de Liège - ULiège > Département des sciences cliniques > Neurologie - Doyen de la Faculté de Médecine
Maquet, Pierre  ;  Université de Liège - ULiège > Centre de recherches du cyclotron - Département des sciences cliniques
Pickard, J. D.
Laureys, Steven  ;  Université de Liège - ULiège > Centre de recherches du cyclotron - Comagroup
Owen, A. M.
Language :
English
Title :
When thoughts become action: An fMRI paradigm to study volitional brain activity in non-communicative brain injured patients
Publication date :
01 July 2007
Journal title :
NeuroImage
ISSN :
1053-8119
eISSN :
1095-9572
Publisher :
Academic Press Inc Elsevier Science, San Diego, United States - California
Volume :
36
Issue :
3
Pages :
979-992
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 19 February 2010

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