The Indirect Genetic Effect Interaction Coefficient ψ: Theoretically Essential and Empirically Neglected.

ABSTRACT: The interaction effect coefficient ψ has been a much-discussed, fundamental parameter of indirect genetic effect (IGE) models since its formal mathematical description in 1997. The coefficient simultaneously describes the form of changes in trait expression caused by genes in the social environment and predicts the evolutionary consequences of those IGEs. Here, we report a striking mismatch between theoretical emphasis on ψ and its usage in empirical studies. Surveying all IGE research, we find that the coefficient ψ has not been equivalently conceptualized across studies. Several issues related to its proper empirical measurement have recently been raised, and these may severely distort interpretations about the evolutionary consequences of IGEs. We provide practical advice on avoiding su

SUBMITTER: Bailey NW 

PROVIDER: S-EPMC8851666 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature