Not wasted on the young: Childhood, trait complexes & human behavioral ecology.

Hypotheses about the evolution of multi-trait organismal features often encounter trade-offs between the precision and historical relevance of tests performed in actualistic contexts. That is, highly precise tests aimed at discriminating between competing hypotheses often incur a risk of explanatory misalignment with the historical phenomenon they target. We illustrate this via a discussion of the evolution of childhood.

What is a trait? Lessons from the human chin.

The chin, a distinguishing feature of Homo sapiens, has sparked ongoing debates regarding its evolutionary origins and adaptive significance. We contend that these controversies stem from a fundamental disagreement about what constitutes a well-defined biological trait, a problem that has received insufficient attention despite its recognized importance in biology. In this paper, we leverage paleoanthropological research on the human chin to investigate the general issue of character or trait identification.

Pan-Africanism vs. single-origin of Homo sapiens: Putting the debate in the light of evolutionary biology.

The scenario of Homo sapiens origin/s within Africa has become increasingly complex, with a pan-African perspective currently challenging the long-established single-origin hypothesis. In this paper, we review the lines of evidence employed in support of each model, highlighting inferential limitations and possible terminological misunderstandings. We argue that the metapopulation scenario envisaged by pan-African proponents well describes a mosaic diversification among late Middle Pleistocene groups.