Fig. 6.

Simon effect analysis. (A) Mean RTs (trimmed at +/− 3 SDs from the mean for each hand in each condition) for trials in the masked priming task that were spatially incongruent, neutral, and congruent. Responses made with both hands show the expected spatial congruency effects, which were not significantly different for the left and right hands (see text for further details). Error bars denote +/− 1 SEM. (B) Mean octile spatial congruency effects as a function of the mean RT for that octile. Calculated by subtracting congruent RTs from incongruent RTs for each octile, for each hand separately. As above, data from the longest and most variable RT bin are included for completeness, and are shown here as dotted lines and open symbols. *Denotes Bonferroni-corrected t-test p < .05.