Article (Scientific journals)
Time-Delay Latency of Resting-State Blood Oxygen Level-Dependent Signal Related to the Level of Consciousness in Patients with Severe Consciousness Impairment.
Rudas, Jorge; Martinez, Darwin; Castellanos, Gabriel et al.
2020In Brain Connectivity, 10 (2), p. 83-94
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Keywords :
disorders of consciousness; functional connectivity; latency, midcingulate cortex; resting-state networks; time delay
Abstract :
[en] Recent evidence on resting-state functional magnetic resonance imaging (rs-fMRI) suggests that healthy human brains have a temporal organization represented in a widely complex time-delay structure. This structure seems to underlie brain communication flow, integration/propagation of brain activity, as well as information processing. Therefore, it is probably linked to the emergence of highly coordinated complex brain phenomena, such as consciousness. Nevertheless, possible changes in this structure during an altered state of consciousness remain poorly investigated. In this work, we hypothesized that due to a disruption in high-order functions and alterations of the brain communication flow, patients with disorders of consciousness (DOC) might exhibit changes in their time-delay structure of spontaneous brain activity. We explored this hypothesis by comparing the time-delay projections from fMRI resting-state data acquired in resting state from 48 patients with DOC and 27 healthy controls (HC) subjects. Results suggest that time-delay structure modifies for patients with DOC conditions when compared with HC. Specifically, the average value and the directionality of latency inside the midcingulate cortex (mCC) shift with the level of consciousness. In particular, positive values of latency inside the mCC relate to preserved states of consciousness, whereas negative values change proportionally with the level of consciousness in patients with DOC. These results suggest that the mCC may play a critical role as an integrator of brain activity in HC subjects, but this role vanishes in an altered state of consciousness.
Disciplines :
Neurosciences & behavior
Author, co-author :
Rudas, Jorge
Martinez, Darwin
Castellanos, Gabriel
Demertzi, Athina  ;  Université de Liège - ULiège > Consciousness-Physiology of Cognition
Martial, Charlotte  ;  Université de Liège - ULiège > Consciousness-Coma Science Group
Carrière, Manon ;  Université de Liège - ULiège > Consciousness-Coma Science Group
Aubinet, Charlène  ;  Université de Liège - ULiège > Consciousness-Coma Science Group
Soddu, Andrea
Laureys, Steven  ;  Université de Liège - ULiège > Consciousness-Coma Science Group
Gomez, Francisco
Language :
English
Title :
Time-Delay Latency of Resting-State Blood Oxygen Level-Dependent Signal Related to the Level of Consciousness in Patients with Severe Consciousness Impairment.
Publication date :
2020
Journal title :
Brain Connectivity
ISSN :
2158-0014
eISSN :
2158-0022
Publisher :
Mary Ann Liebert, United States - New York
Volume :
10
Issue :
2
Pages :
83-94
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 24 April 2020

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