Brain-Computer Interface application: auditory serial interface to control a two-class motor-imagery-based wheelchair.
Ricardo Ron-Angevin, Francisco Velasco-Álvarez, Álvaro Fernández-Rodríguez and 3 others
PMID 28558741WHAT IT FOUND
Healthy adults who passed a brain-control test steered a wheelchair through spoken cues.
They chose commands correctly often, but some paths took over 15 minutes. This is feasibility in able-bodied users, not evidence it helps patients.
Key findings
01Ten of seventeen healthy participants continued after calibration; seven were excluded because their classification error was above 30%.
02Except subject A3, those who continued were able to control the proposed brain-controlled wheelchair, and the real session used only auditory cues.
03Real navigation was slow and variable: average absolute time was 679 ± 308 seconds for task 1, and some users took more than 15 minutes.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The participants were healthy young adults, not people with locked-in syndrome or mobility disability, so the study does not show what patients can do. Seven of seventeen participants were excluded at calibration because their error rate was above 30%, so only a selected group continued. The study tested only healthy adults and used one wheelchair control paradigm. Real navigation times varied widely, from under 4 minutes to over 15 minutes per path. The wheelchair moved slowly: about 10 s to advance 1 m and 15 s for a 90° turn. No online or offline artifact detection was used. The virtual and real navigation tasks were not directly comparable because wrong commands were handled differently and the paths differed. The usability tests were ad hoc and were completed only by participants who finished at least one navigation task.
The easy way to misread this
Do not read the high performance scores as proof that this wheelchair is ready for patients. The study tested healthy adults, excluded seven of seventeen at calibration, and real navigation took from under 4 minutes to over 15 minutes per path.