Building on Gray’s original Reinforcement Sensitivity Theory, we examined how individual differences in students’ activation of the behavioral inhibition (BIS) and the behavioral approach (BAS) systems relate to
overcommitment to one’s studies and study engagement, and how these two forms of heavy study investment relate to three academically relevant outcomes. Using data from 565 Dutch university students, structural equation modeling showed that BIS-activation was positively associated with overcommitment to one’s studies, which in turn was positively related to exhaustion and the intention to quit one’s studies. BAS-activation was positively associated with study engagement, which in turn was negatively related to exhaustion and the intention to quit, and positively related to academic performance. Bootstrapping techniques revealed a mediating role of the two forms of heavy study investment. Apparently, BIS- and BAS-activation are associated with heavy study behavior, student well-being, and study outcomes