Studies on laboratory animals have found a relationship between impulsivity and alcohol-related behaviors. In one study, rats with higher impulsivity, indicated by steeper discounting of delayed rewards, consumed more alcohol. In mice, greater impulsivity was initially associated with lower alcohol-induced locomotor stimulation. However, with repeated alcohol exposure, these mice showed increased alcohol-induced locomotor activity. Impulsive discounting in rats had a broader association with alcohol use, while in mice, it correlated in the expected direction after repeated alcohol exposure.