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Residual implicit and explicit language abilities in patients with disorders of consciousness: A systematic review
- Source :
- Neuroscience & Biobehavioral Reviews. 132:391-409
- Publication Year :
- 2022
- Publisher :
- Elsevier BV, 2022.
-
Abstract
- Language assessment in post-comatose patients is difficult due to their limited behavioral repertoire; yet associated language deficits might lead to an underestimation of consciousness levels in unresponsive wakefulness syndrome (UWS) or minimally conscious state (MCS; -/+) diagnoses. We present a systematic review of studies from 2002 assessing residual language abilities with neuroimaging, electrophysiological or behavioral measures in patients with severe brain injury. Eighty-five articles including a total of 2278 patients were assessed for quality. The median percentages of patients showing residual implicit language abilities (i.e., cortical responses to specific words/sentences) were 33 % for UWS, 50 % for MCS- and 78 % for MCS + patients, whereas explicit language abilities (i.e., command-following using brain-computer interfaces) were reported in 20 % of UWS, 33 % of MCS- and 50 % of MCS + patients. Cortical responses to verbal stimuli increased along with consciousness levels and the progressive recovery of consciousness after a coma was paralleled by the reappearance of both implicit and explicit language processing. This review highlights the importance of language assessment in patients with disorders of consciousness.
Details
- ISSN :
- 01497634
- Volume :
- 132
- Database :
- OpenAIRE
- Journal :
- Neuroscience & Biobehavioral Reviews
- Accession number :
- edsair.doi.dedup.....c09ad76edff3a5fd2c5e1f1513c99997