Figure 11. Spelling speed for each of the 4 conditions plotted against the number of repetitions.

Thin gray lines depict results for single participants and the solid black line depicts the mean. Red dashed lines represent the spelling speed for fixed levels of symbol selection accuracy. Spelling accuracy for the empirical data (solid black line) can be deduced by comparing the black solid line to the red dashed lines. The accuracy is based on the calibration data for each condition.