Working memory task. Correct response times (in ms) averaged across participants are plotted for the four conditions in which booms were presented. Error bars represent standard errors of the mean. We chose to plot response times for better readability, but the statistical tests were carried on the z-scores. The dotted squares in the x-axis legend around cards #−4 to #−1 and cards #0 and #1 illustrate that it is the means for these two groups of cards that were compared in the statistical analysis.