Figure 1.

The selective visual attention task. (a) Each trial started with a square depicting static noise for 1 s. Thereafter, six objects were presented which moved around randomly for 10 s. The subject's had to count how often the white object bounced against one of the edges of the square. At the end of each trial a question mark was shown, prompting the subjects to report the number of edge bounces. (b) The last, “critical” trial is shown. Note the monkey (unexpected event) which crossed the square from right to left (see Supporting Information, for animations).