Effects of triazolam (n=6), zolpidem (n=6), zaleplon (n=4), and TPA023B (n=4) on self-ordered spatial search (SOSS) accuracy (top) and trial completion (bottom) for trials with each number of boxes in the SOSS procedure. The horizontal dotted lines in the top row of graphs represent chance accuracy on two-box (50%), three-box (22.2%), and four-box (9.38%) trials.