FIG. 2.

Behavioral response. These are the group averages of rejection or protest rates for three distinct distributions of offers displayed to the responders, $0–$20 (unequal low offers), $40–$60 (nearly equal or equal offers), and $80–$100 (unequal high offers) out of $100. Each participant played 30 rounds of each game (UG, IG, and FDG) during three functional magnetic resonance imaging runs. Approximately 2% of the total earnings were given to the participants. Error bars here represent standard errors of the means. Color images available online at www.liebertpub.com/brain