Watch a 23-minute conference talk from the Models of Consciousness Conferences exploring how psychological variables emerge and become measurable through operant behavior and relational responses. Delve into a theoretical framework that posits measurable psychological variables only emerge when relational responses align with real number structures through environmental selection. Examine how fitness consequences drive this multilevel selection process, suggesting that quantitative psychological variables function as context-dependent fitness predictors. Learn how this theory addresses fundamental questions about the nature of psychological variables, their quantitative properties, measurement methods, and the underlying reasons for psychological quantification. Discover testable hypotheses emerging from this theoretical framework that connects behavioral selection, fitness prediction, and psychological measurement.