Free-spelling performance.

Performance rates of all individual participants and the grand average during free-spelling. The table lists the total number of K trials (i.e., including backspaces), total number of K’ spelled symbols at the end of the session, number of C correctly spelled symbols, the average time T needed for spelling one symbol (including overhead: inter-trial time), and an estimate of Symbols Per Minute (SPM). Note that only early-stopping was applied, which was trained with a fixed targeted accuracy of 95 percent for all participants. Note that C is an informal measure of correctness.