BCI-vSpeller is designed for Vietnamese, a character-dense language. Its virtual keyboard includes more than 160 selectable keys covering the full set of Vietnamese characters, tone marks, and special symbols. The system uses motor imagery EEG signals as input, classifies the motor imagery tasks with a linear discriminant analysis (LDA) algorithm, and integrates a lightweight language model to provide real-time word suggestions for faster typing. The researchers measured the average typing speeds of the two participants in initial experiments.
Vietnamese BCI Speller Types up to 4.95 Characters a Minute in Two-Person Pilot
Summary
Two participants typed Vietnamese at 4.95 and 3.45 characters per minute using motor imagery EEG in a pilot test of BCI-vSpeller, a speller built around a custom virtual keyboard of more than 160 selectable keys covering characters, tone marks and special symbols. Researchers from VNU University of Engineering and Technology in Hanoi, reported the findings in Technology and Disability. BCI spellers let users enter text by controlling an interface with mental signals, an approach aimed at people with severe speech and mobility impairments.
Why it matters
BCI speller results are overwhelmingly reported for languages that fit a small alphabet, so a writing system needing more than 160 selectable targets is a useful stress test of how selection accuracy holds up as the target set grows. At roughly 5 characters a minute from two participants, the rate is nowhere near conversational, but the value here is the design problem, not the throughput.
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doi.org 2026-09-04