Fig. 3.

The effect of varying the experimental noise level. (A–D) The social response function for hypothetical experiments with noise levels in the ratios $\eta =1/\mathrm{3,2}/\mathrm{3,3}/2$, and 3 relative to those of the habitual environment. As in Fig. 2, red circles indicate the average observed response, while black circles indicate specific sequences of past decisions, with size indicating the relative probability of each sequence. (E–H) The corresponding proportions of aggregate outcomes for each experimental noise level. Social response and aggregate cohesion are stronger in experiments with noise levels lower than those of the habitual environment ($\eta <1$) and correspondingly weaker in experiments with greater noise levels ($\eta >1$).