English: Example movie of an opponent’s pupil. Video depicting three games as the players viewed it in the informed-eye and naïve-eye conditions condition. If you want to try the experiment yourself, watch the movies and pick the best option to beat your opponent. The audio track consists of the words “rock”, “paper”, and “scissors”, presented in 4-s intervals in the identical (randomly ordered) sequence the opponent heard when the video was recorded. In case the video format does not work on your computer, various formats are available at http://www.staff.uni-marburg.de/~wetgast/rps/ (Correct answers for both movies: Opponent 1 selected “Rock” (3rd option). Opponent 2 selected “Paper” (1st option). Opponent 3 selected “Scissors” (2nd option). Winning options thus were “paper” in the first game, “Scissors” in the second and “rock” in the last).