Development of an electrooculogram-based eye-computer interface for communication of individuals with amyotrophic lateral sclerosis.
Won-Du Chang, Ho-Seung Cha, Do Yeon Kim and 2 others
PMID 28886720WHAT IT FOUND
Eye-writing digits using electrical signals worked for two of three people with ALS, with recognition rates above 93%.
The third person's accuracy was lower initially but improved to zero errors by the final trial. This suggests the method is feasible, though only three patients were tested.
Key findings
01Recognition rates for two of three participants with ALS were comparable to healthy participants, while one participant showed lower accuracy.
02The participant with the lowest initial accuracy showed a decrease in errors over trials, reaching zero errors in the last session.
03The system achieved overall recognition rates exceeding 95% in healthy participants using specific algorithms.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study included only three individuals with ALS, which is too small a sample to determine general feasibility or effectiveness for the wider population. There was no control group or comparison with standard communication methods; the study only tested the technical performance of the new system. The ALS participants had varying functional levels (ALSFRS 17, 18, 25), and the results may not apply to those with more advanced disease or different oculomotor deficits. Data from participants with ALS were not shared due to IRB restrictions, limiting independent verification. The system required a specific training procedure and showed significant variability in accuracy between participants.
Declared interests
The authors declared no competing interests. The study was supported by the National Research Foundation of Korea.
The easy way to misread this
Do not assume this eye-writing system is ready for clinical use or that it will work reliably for all patients with ALS. The study tested only three patients, and one had significant difficulty initially. The high accuracy rates reported for healthy participants do not necessarily translate to the same ease of use for patients with oculomotor deficits common in ALS.