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View full-text article in PMC

. 2013 Aug 26;8(8):e73302. doi: 10.1371/journal.pone.0073302

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© 2013 Naber et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Three opponents each played 25 modified RPS games against a computer. During these games video of the opponents’ eyes was recorded along with the audio produced by the computer. For all conditions, except “100% validity”, all 75 of these games were used. For the 100% validity condition, 30 (out of 45) videos in which maximum pupil dilation indeed followed the choice of the opponent were selected with 10 games for each of the 3 intervals respectively. These valid games were then randomly presented as in the original "naïve eye" condition. Ten players participated first in the "naïve eye" and subsequently in the "informed eye" condition to allow a within-subject comparison. A distinct set of 10 players participated in the reconstructed pupil condition. Half (5) of each group participated in addition in the "no video" control. Finally, a distinct set of 10 players participated in the 100% validity condition.