Response time was shorter on correct than incorrect trials in Experiment 1 but not in Experiment 2.

<p>(<b>A</b>) Plotted is the difference in normalized RT between correct and incorrect trials across all subjects in Experiment 1. The solid gray line shows the average difference over all schedules, and the gray asterisk next to it indicates that this difference was significantly different from 0 (two-sided sign test, <i>p</i> < 0.05). Each black asterisk shows that the difference in RT between correct and incorrect trials for a given schedule was significantly different from 0 (two-sided sign test, <i>p</i> < 0.05), and the outliers are indicated by circles with red crosses. (<b>B</b>) The same as in (A) but for Experiment 2. In Experiment 2, the difference in the normalized RT between correct and incorrect trials was not different from 0 in any schedule or in the average data.