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One idea that has been repeatedly tested is that low mood can make people better at analyzing their environments. Classic experiments by psychologists Lyn Abramson and Lauren Alloy focused specifically on the accuracy of people’s perceptions of their control of events, using test situations that systematically varied in how much control the subject truly had. In different conditions, subjects’ responses (pressing or not pressing a button) controlled an environmental outcome (turning on a green light) to varying degrees. Interestingly, subjects who were dysphoric (in a negative mood and exhibiting other symptoms of depression) were superior at this task to subjects who were nondysphoric (in a normal mood). Subjects who were in a normal mood were more likely to overestimate or underestimate how much control they had over the light coming on.7 Dubbed depressive realism, Alloy and Abramson’s work has inspired other, often quite sophisticated, experimental demonstrations of ways that low mood can lead to better, clearer thinking.8 In 2007 studies by Australian psychologist Joseph Forgas found that a brief mood induction changed how well people were able to argue. Compared to subjects in a positive mood, subjects who were put in a negative mood (by watching a ten-minute film about death from cancer) produced more effective persuasive messages on a standardized topic such as raising student fees or aboriginal land rights. Follow-up analyses found that the key reason the sadder people were more persuasive was that their arguments were richer in concrete detail (see Figure 2.2).9 In other experiments, Forgas and his colleagues have demonstrated diverse benefits of a sad mood. It can improve memory performance, reduce errors in judgment, make people slightly better at detecting deception in others, and foster more effective interpersonal strategies, such as increasing the politeness of requests. What seems to tie together these disparate effects is that a sad mood, at least of the garden variety, makes people more deliberate, skeptical, and careful in how they process information from their environment.
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Jonathan Rottenberg (The Depths: The Evolutionary Origins of the Depression Epidemic)