Competing at the Cybathlon championship for people with disabilities: long-term motor imagery brain-computer interface training of a cybathlete who has tetraplegia.
Attila Korik, Karl McCreadie, Niall McShane and 6 others
PMID 36068570WHAT IT FOUND
A pilot with tetraplegia improved BCI race times during training but slowed down before competition.
The authors link this drop to stress and unstable relaxation signals, suggesting future training must focus on maintaining calm states under pressure.
Key findings
01The pilot's race completion times significantly improved over the training period but degraded in the days immediately before and during the competition.
02Decoding accuracy for the 'relax' command was less stable and had lower accuracy than the movement commands, which may have contributed to the performance drop.
03Skills learned in 2019 transferred to 2020, as race times at the start of the second year's training matched the best times from the previous year.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study reports on a single participant, so results cannot be generalized to other people with tetraplegia or BCI users. The pilot had extensive prior experience with BCIs since 2009, which may not represent the learning curve for new users. EEG data from the 2020 race day was not saved due to an oversight, limiting the analysis of the performance drop in that year. The study design was for a competition, not a controlled clinical trial, so many variables (stress, environment, fatigue) were not controlled or measured directly. The authors note that the 'relax' classifier was unstable, but the specific causes of this instability (e.g., psychological state vs. signal drift) are inferred rather than definitively proven.
Declared interests
The authors declare no competing interests. The work was supported by a grant from the Department for the Economy (Northern Ireland).
The easy way to misread this
Do not conclude that this BCI system is clinically effective for rehabilitation or daily living. The study describes a specialized gaming setup for a competition, where performance dropped under stress. The instability of the 'relax' command and the single-subject nature mean this does not represent a reliable assistive technology for everyday use.