The Notion of ‘Group’ and Tests of Group Selection

This paper examines the empirical aspect of the debates over group selection. I argue that specific narrow readings of the notion of ‘group’ result in a deficient experimentation of the group selection process. Criteria for empirical testability are presented and used to reexamine two well-known experiments of group selection. I argue that the former holds a narrow image of ‘group’ that does not distinguish group selection from selection at other levels; while the latter holds a multifaceted image of ‘group’ that offers a way to achieve substantive progress in the debate. However, most supporters and opponent of group selection maintain a narrow and restricted image of ‘group’, which implicitly undermines informative details regarding population dynamics and population structure. These details may improve our understanding of the evolution of altruism and the evolution of sociality. To conclude, adopting a wide-ranging meaning of ‘group’ may empirically advance the group selection debates.