Risk and Reward Are Processed Differently in Decisions Made Under Stress

Years of research have shown that stress influences cognition. Most of this research has focused on how stress affects memory and the hippocampus. However, stress also affects other regions involved in cognitive and emotional processing, including the prefrontal cortex, striatum, and insula. New research examining the impact of stress on decision processes reveals two consistent findings. First, acute stress enhances selection of previously rewarding outcomes but impairs avoidance of previously negative outcomes, possibly due to stress-induced changes in dopamine in reward-processing brain regions. Second, stress amplifies gender differences in strategies used during risky decisions, as males take more risk and females take less risk under stress. These gender differences in behavior are associated with differences in activity in the insula and dorsal striatum, brain regions involved in computing risk and preparing to take action.

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