64 matrix, 3.75 × 3.75 × 3.8 mm voxels, TR = 2000 ms, TE = 30 ms, 90° flip angle, 32 slices no gap, slice thickness = 3.8 mm) as an event-related visual working memory (VWM) task was administered (Luck and Vogel, 1997; Tapert et al., 2004; Trim et al., 2010b). The VWM task trails consisted of 2 (easy working memory load), 4 (moderate load), or 6 (supra-span load) colored dots presented for 100 ms at random locations on a gray background that was back-projected onto a screen. After a 1000 ms delay, the subsequent trial (2000 ms) included the same number of dots presented in the same location that were either the same color array or one dot was a different color. For each trial, participants indicated whether the color displays were the same (“press button 1”) or if they differed (“press button 2”). Each trial was followed by a 500 ms timeout. Participants completed 30 trials of each type (2, 4, or 6 dots) presented randomly, in addition to 69 fixation (rest) trials of variable duration to provide an optimized fast-event related sequence (256 repetitions, total task time of 8 minutes, 32 seconds).
