The challenge of controlling an auditory BCI in the case of severe motor disability.
Perrine Séguin, Emmanuel Maby, Mélodie Fouillen and 5 others
PMID 38238759WHAT IT FOUND
An auditory brain-computer interface allowed 17 of 18 healthy subjects to communicate, but only 2 of 7 patients with severe motor disability achieved control.
This gap suggests tools validated in healthy users may not work for the intended patients without significant redesign.
Key findings
0117 of 18 healthy subjects successfully controlled the auditory BCI, whereas only 2 of 7 patients with severe motor disability could do so.
02Five patients failed to control the interface because they lacked the expected brain response to deviant sounds, despite being able to hear them.
03Patients who could not control the BCI often showed signs of more severe oculomotor impairment, suggesting eye movement issues may interfere with auditory attention tasks.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The patient group was very small (7 patients), making it difficult to generalize findings. The patients included still had some residual communication abilities (e.g., eye movements), so the study does not show how the BCI works for completely locked-in patients with no motor control. Signal quality was poor in many patients due to artifacts from mechanical ventilation and hospital equipment, which may have contributed to the failure. The study did not include a control group of patients with similar motor disabilities who did not attempt the BCI, so the effect of fatigue or learning cannot be fully isolated.
Declared interests
The study was funded by Fondation pour la Recherche Médicale, Agence Nationale de la Recherche, and Fondation Perce-Neige. The authors declared no competing interests.
The easy way to misread this
Do not conclude that auditory BCIs are ineffective for all patients with severe motor disability. The study shows they are unreliable for many, but two ALS patients achieved perfect control. The failure was linked to specific brain response patterns (lack of P300) and signal artifacts, not necessarily a universal inability to use the technology.