Alcohol’s Effects During Uncertain and Uncontrollable Stressors in the Laboratory

Alcohol’s effects on reactivity to stressors depend on the nature of the stressor and the reactivity being assessed. Research that identifies characteristics of stressors that modulate reactivity and clarifies the neurobehavioral, cognitive, and affective components of this reactivity may help prevent, reduce, or treat the negative impacts of acute and chronic alcohol use and have implications for other psychopathology involving maladaptive reactivity to stressors. We used a novel, multimeasure, cued, electric-shock-stressor paradigm in a greater-university community sample of adult recreational drinkers to test the effects of alcohol ( n = 64), compared with no alcohol ( n = 64), on reactivity to stressors that vary in both their perceived certainty and controllability. Preregistered analyses suggested alcohol significantly dampened subjective anxiety (self-report) and defensive reactivity (startle potentiation) more during uncertain stressors than during certain stressors regardless of controllability, which suggests that stressor uncertainty—but not uncontrollability—may be sufficient to enhance alcohol’s dampening of stress reactivity and thus negative reinforcement potential.