Extended Data Fig. 7. Human decision-making data.

Both humans and macaques perform binary value-based decision-making in a similar manner. These human data were first reported by Chau and colleagues⁷, but here they have been re-analysed (with permission) using the same approach as the one applied to the data obtained from macaques in experiment 1. (a) 21 subjects performed 300 choices each; a model comparison identified the same subjective value model (ηβθ) described above as the one best explaining their behaviour, with a Schwarz weight > 0.999. Side bias ζ was not tested. (b) The BIC score difference with the second-best model was 75. (c) The human subjects displayed a range of different behaviours, as revealed by the histograms of the integration, magnitude versus probability, and inverse temperature parameter fits. In particular, we noted how some subjects were fully additive (η=0) but others were very good at integrating the two dimensions of value (with η approaching 1).