Temporal organization of an experimental session. A session consisted on eight consecutive blocks, which in turn consisted of a sequence of twenty trials. On each trial, subjects watched a sequence of three dot-arrays on a 4 × 4 grid, separated by a fixation screen with a center cross. Then a distractor (Distr) image was presented, which could be a dot array, an emotional image, a neutral image or a flat-color screen. Then a Probe dot-array was presented and the subject had to indicate if the dot in the probe had been presented in one of the previous three arrays. After 1.5 seconds, feedback was provided to the subject regarding its performance on the current trial. A similar version of this figure was previously published in ref.8.