Abstract Matt is an unusually talented scholar, with seminal contributions in many areas (cognitive ability, environmental influences, substance use, etc.). One key theme that undergirds and unites his work is his development of novel research designs and experiments of nature capable of estimating causal inferences with unusual precision. In this contribution to his Festshrift, I illuminate key models and experiments developed by Matt and their contributions to the field. In lieu of new empirical data, I also present a new idiographic behavioral genetic research design – to be called ‘narrative non-shared environmental identification’ – in which we leverage idiographic, person-specific measurement tools to meaningfully study the effective non-shared environment for the first time.
S. Alexandra Burt (Mon,) studied this question.