Yes, they are synthesizing speech from thought while the person mimicked speaking moving their mouth but making no sound. > Although synthesis performance for

Yes, they are synthesizing speech from thought while the person mimicked speaking moving their mouth but making no sound. > Although synthesis performance for mimed speech was inferior to the performance for audible speech—which is probably due to absence of phonation signals during miming—this demonstrates that it is possible to decode important spectral features of speech that were never audibly uttered (P < 1 × 10−11 compared to chance, n = 58; Wilcoxon signedrank test) and that the decoder did not rely on auditory feedback