This study demonstrates the negative moderating effect of general self-efficacy on the relationship between need for cognition, which refers to stable individual differences in people's tendencies to engage in and enjoy cognitive activity, and cognitive effort. This negative moderating effect of general self-efficacy has been termed "plasticity." Scholars assume the relationship between need for cognition and cognitive effort is true by definition. The study uses data from 144 U.S. college students and employs moderated regression analysis followed by subgroup analysis to demonstrate plasticity. The results set a boundary condition to the generally presumed relationship between need for cognition and cognitive effort, thereby improving the understanding of how these phenomena are related.