Fact · Voice and AI
32percent character error rate
In a 2025 preprint, the Brain2Qwerty decoder reached an average character error rate of 32 percent with magnetoencephalography (MEG) recordings.
Checked against its source on October 17, 2026
In the source's own words
“With MEG, Brain2Qwerty reaches, on average, a character-error-rate (CER) of 32% and substantially outperforms EEG (CER: 67%).”
Brain-to-Text Decoding: A Non-invasive Approach via Typing, Jarod Levy et al., arXiv (preprint), 2025, Abstract.
Open the original- What it measures
- The decoder reads brain recordings made while healthy volunteers type. MEG measures the magnetic fields of brain activity from outside the head, using a room-sized scanner.
- What it does not show
- A character error rate counts wrong letters, so it cannot be compared directly with word error rates or with words per minute. It is a preprint, and the recording equipment is far too large and costly for everyday use.