Linking the evolution of two prefrontal brain regions to social and foraging challenges in primates.

Even if the best model for DLPFC includes population density, its influence was very small (0.006±0.003) and failed to reach significance (p=0.067).

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Interestingly, the whole brain volume (which is strongly correlated with both FP and DLPFC) seems to show an intermediate tendency: even if the effect of population density appears smaller than that of daily traveled distance (beta weight is one order of magnitude smaller), it is clearly significant, and the ‘leave-one-out’ procedure indicated that it was only slightly less reliable than daily traveled distance, with a significant decrease in model fit quality for four vs one combination of species.

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