Carl posts about differences between the babies of foragers and farmers/moderns. These sort of shifts of infant behavior dependent on the input that parents (and the ability of the babies to manipulate said parents) provide contingent upon social-environmental constraints make me cautious about assuming an overpowering EEA across a host of variables. Additionally, babies also likely differ in intrinsic temperament, as do the sexes, and according to Jerome Kagan infants of different populations also exhibit variant modal personalities. All this suggests a dynamism on a variety of levels, from the proximate behavorial context all the way to the microevolutionary scale, which is underemphasized by fixating on monomorphic universal traits.
Related: John Hawks also comments.
Posted by razib at 03:05 AM