Human Wagering Behavior Depends on Opponents' Faces Schlicht, Erik J. ; Shimojo, Shinsuke ; Camerer, Colin F. ; Battaglia, Peter ; Nakayama, Ken Abstract Publication: PLoS ONE Pub Date: July 2010 DOI: 10.1371/journal.pone.0011663 Bibcode: 2010PLoSO...511663S