Brain-Computer Interface-Based Communication in the Completely Locked-In State.
Despite partial success, communication has remained impossible for persons suffering from complete motor paralysis but intact cognitive and emotional processing, a state called complete locked-in state (CLIS). Based on a motor learning theoretical context and on the failure of neuroelectric brain-co...
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2017-01-01
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Online Access: | https://doi.org/10.1371/journal.pbio.1002593 |
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doaj-716a9b7837ce405fb4556e655a4a5a6a2021-07-02T16:20:59ZengPublic Library of Science (PLoS)PLoS Biology1544-91731545-78852017-01-01151e100259310.1371/journal.pbio.1002593Brain-Computer Interface-Based Communication in the Completely Locked-In State.Ujwal ChaudharyBin XiaStefano SilvoniLeonardo G CohenNiels BirbaumerDespite partial success, communication has remained impossible for persons suffering from complete motor paralysis but intact cognitive and emotional processing, a state called complete locked-in state (CLIS). Based on a motor learning theoretical context and on the failure of neuroelectric brain-computer interface (BCI) communication attempts in CLIS, we here report BCI communication using functional near-infrared spectroscopy (fNIRS) and an implicit attentional processing procedure. Four patients suffering from advanced amyotrophic lateral sclerosis (ALS)-two of them in permanent CLIS and two entering the CLIS without reliable means of communication-learned to answer personal questions with known answers and open questions all requiring a "yes" or "no" thought using frontocentral oxygenation changes measured with fNIRS. Three patients completed more than 46 sessions spread over several weeks, and one patient (patient W) completed 20 sessions. Online fNIRS classification of personal questions with known answers and open questions using linear support vector machine (SVM) resulted in an above-chance-level correct response rate over 70%. Electroencephalographic oscillations and electrooculographic signals did not exceed the chance-level threshold for correct communication despite occasional differences between the physiological signals representing a "yes" or "no" response. However, electroencephalogram (EEG) changes in the theta-frequency band correlated with inferior communication performance, probably because of decreased vigilance and attention. If replicated with ALS patients in CLIS, these positive results could indicate the first step towards abolition of complete locked-in states, at least for ALS.https://doi.org/10.1371/journal.pbio.1002593 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ujwal Chaudhary Bin Xia Stefano Silvoni Leonardo G Cohen Niels Birbaumer |
spellingShingle |
Ujwal Chaudhary Bin Xia Stefano Silvoni Leonardo G Cohen Niels Birbaumer Brain-Computer Interface-Based Communication in the Completely Locked-In State. PLoS Biology |
author_facet |
Ujwal Chaudhary Bin Xia Stefano Silvoni Leonardo G Cohen Niels Birbaumer |
author_sort |
Ujwal Chaudhary |
title |
Brain-Computer Interface-Based Communication in the Completely Locked-In State. |
title_short |
Brain-Computer Interface-Based Communication in the Completely Locked-In State. |
title_full |
Brain-Computer Interface-Based Communication in the Completely Locked-In State. |
title_fullStr |
Brain-Computer Interface-Based Communication in the Completely Locked-In State. |
title_full_unstemmed |
Brain-Computer Interface-Based Communication in the Completely Locked-In State. |
title_sort |
brain-computer interface-based communication in the completely locked-in state. |
publisher |
Public Library of Science (PLoS) |
series |
PLoS Biology |
issn |
1544-9173 1545-7885 |
publishDate |
2017-01-01 |
description |
Despite partial success, communication has remained impossible for persons suffering from complete motor paralysis but intact cognitive and emotional processing, a state called complete locked-in state (CLIS). Based on a motor learning theoretical context and on the failure of neuroelectric brain-computer interface (BCI) communication attempts in CLIS, we here report BCI communication using functional near-infrared spectroscopy (fNIRS) and an implicit attentional processing procedure. Four patients suffering from advanced amyotrophic lateral sclerosis (ALS)-two of them in permanent CLIS and two entering the CLIS without reliable means of communication-learned to answer personal questions with known answers and open questions all requiring a "yes" or "no" thought using frontocentral oxygenation changes measured with fNIRS. Three patients completed more than 46 sessions spread over several weeks, and one patient (patient W) completed 20 sessions. Online fNIRS classification of personal questions with known answers and open questions using linear support vector machine (SVM) resulted in an above-chance-level correct response rate over 70%. Electroencephalographic oscillations and electrooculographic signals did not exceed the chance-level threshold for correct communication despite occasional differences between the physiological signals representing a "yes" or "no" response. However, electroencephalogram (EEG) changes in the theta-frequency band correlated with inferior communication performance, probably because of decreased vigilance and attention. If replicated with ALS patients in CLIS, these positive results could indicate the first step towards abolition of complete locked-in states, at least for ALS. |
url |
https://doi.org/10.1371/journal.pbio.1002593 |
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