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Neurobiological evidence for the bilinear model. BOLD signal in the ventral striatum (top) and subgenual cingulate gyrus (bottom) covaried positively with reward in the low-cost conditions (blue), in which participants decided between mixtures of money and mild electric stimulation. This correlation was attenuated in the high-cost condition (red), in which participants decided between mixtures of money and painful electric stimulation. Figure adapted from Talmi et al. (2009).
