Participants completed six additional executive function tasks. The keep-track, letter-memory, and spatial-2-back tasks were designed to tap the ability to flexibly update the contents of working memory with new relevant information and delete no-longer-relevant information when necessary. In the keep-track task, participants saw lists of 15 words presented serially and at the end reported the most recently presented words belonging to two to four target categories. In the letter-memory task, participants continuously said aloud the three most recent letters in a serially presented list of unpredictable length, reporting the last three letters at the end of the list. In the spatial-2-back task, participants saw a series of 25 locations flash and had to indicate for each one whether it was the same as the one that had flashed two trials before. The dependent measure for all three tasks was proportion correct.
