Fig. 9.
Performance of participants T2 and T6’s interaction with the FlashSpeller application as measured by the normalized mutual information (CYX). Left: CYX when using same-day and historical decoders during copy-phrase blocks (yellow and blue bars, respectively) and when using historical decoder during free spelling with and without the word completion option (full and empty purple bars). Maximum theoretical performance, described as participant always selecting the intended spelling option or character, is 1. Right: the CYX as a function of time (colored dots) and its linear ordinary least squares fit (broken lines). Top right corner displays P values for testing significant correlation between the CYX and time. Performance is shown as mean CYX. Error bars show 95% confidence intervals. Error bars show 95% confidence intervals. ns, Nonsignificant difference (P ≥ 0.05); *P < 0.05.