Notice the difference? In Exhibit A, there are 60 words that are matched with 5 different colors. Each word appears with one of each color over five trials. There is a total number of trials of 300. In Exhibit B, there are 100 words total. Each word is matched with each color, but over four blocks of 25 trials per block? I have worked with other sorts of reaction time tasks, and generally there is some painstaking work that goes into making sure that each stimulus-response pair gets presented once in each trial, and the total number of trials adds up logically, as is the case with Exhibit A. What I see with Exhibit B does not quite add up. What am I missing?