Figure 2.

Biased acceptance of objectively identical offers by contextual manipulation. Each bar represents rate of acceptance (±SEM) of the M set of offers that spans the full range of offer proportions from 0.08 to 0.50. The M set is presented in three different contexts, representing a manipulation of contextual fairness: M-in-L (more fair, interleaved with lower offers), M-alone (neutral, presented alone), and M-in-H (less fair, interleaved with higher offers). The rate of acceptance is normalized with respect to the rate of acceptance in the neutral M-alone condition. Data are shown for the main session for the scanned group (n = 16) and the combined data from all subjects including both the scanned subjects and those who solely underwent behavioral testing (n = 32).