Related Experiment Video
Updated: May 11, 2026
07:37
Assessment and Communication for People with Disorders of Consciousness
Published on: August 1, 2017
Brain communication in the locked-in state.
Daniele De Massari1, Carolin A Ruf, Adrian Furdea
1Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Germany. demassar@alice.it
Brain : a Journal of Neurology
|April 30, 2013
Summary
Researchers developed a novel Pavlovian semantic conditioning paradigm to enable communication for patients in a completely locked-in state. While initial results showed variable performance, accuracies up to 70% were achieved, highlighting potential for brain-computer interface advancement.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Rehabilitation Medicine
Background:
- Patients in a completely locked-in state lack communication abilities, posing a significant challenge for brain-computer interface (BCI) research.
- Existing BCI paradigms and physiological signals have not yet enabled sustained communication for individuals in this state.
Observation:
- A novel Pavlovian semantic conditioning paradigm was introduced to facilitate basic communication by discriminating covert 'yes'/'no' responses.
- Three patients with advanced amyotrophic lateral sclerosis (ALS), including one completely locked-in state patient, participated in extended trials.
- Vigilance levels were monitored using auditory oddball procedures to assess their impact on BCI performance.
Findings:
- Average online classification accuracies for electroencephalographic signals were near chance level across all participants.
- Offline classification using a non-linear classifier improved accuracy to 70% in one locked-in state patient.
- The completely locked-in state patient achieved up to 70% communication accuracy in some sessions, despite intact cognition, but performance was not uniform.
- Rapid vigilance drops were observed, suggesting attentional and circadian variations impact BCI communication.
Implications:
- The Pavlovian semantic conditioning paradigm shows promise for enabling communication in completely locked-in state patients.
- Further paradigm modifications are necessary to achieve reliable and sustained BCI control.
- Addressing vigilance fluctuations is crucial for optimizing BCI effectiveness in locked-in and completely locked-in states.
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