After 44-48 seconds one of two expected events occurred: in the Umbrella woman condition, a tall woman holding an open umbrella walked through the action. In the Gorilla condition, a shorter woman wearing a gorilla costume walked through the action in the same way, the unexpected event lasted 5 secs, players ignored unexpected event.
In the transparent condition, the white team,black team and unexpected event were all filmed separately, rendered partially transparent and superimposed. In the opaque condition, all 7 actors were filmed simultaneously as a live event.