Fig. 1.

Relationship between numerical magnitude and decision making during the dictator game. A: we observed a significant correlation between mean %bisection errors in the number pair bisection task (x-axis) with the amount of an individual’s donation during the dictator game task (y-axis). B; changing numerical magnitude perception using right-sided cold irrigation (RIGHTCOLD + RIV), which biases individuals toward smaller magnitudes results in subjects becoming less generous in their donation. Conversely, during left-sided warm irrigation (LEFTWARM + RIV) where subjects are biased toward larger numbers they correspondingly become more generous in their donation during the dictator game task. **P < 0.001, significant difference. Error bars indicate SE. Note; combined visuo-vestibular stimulation that did not alter numerical magnitude perception, namely left-sided cold irrigation (LEFTCOLD + RIV) and right-sided warm irrigation (RIGHTWARM + RIV), did not alter prosocial choices when compared with the corresponding caloric alone condition.