FIGURE 2.

All trials started with a 2-s fixation cross. (A) In conditioning trials the subsequent search array was presented for 5 s and included a colored annulus and a colored diamond amongst gray distracter stimuli. Participants were instructed to attend to the color of the annulus in order to predict whether an electric shock was going to be delivered subsequently. (B) In search trials, previously trained colors were introduced as distracters to interfere with the required eye movement to a shape singleton (diamond).