Sleep Renormalizes Negative Emotional Generalization

Sleep selectively strengthens positive emotional generalization and reduces negative generalization, while wakefulness favors negative generalization in a face-learning paradigm.

• Why it matters: Negative overgeneralization is linked to anxiety and PTSD and co-occurs with sleep disruption, but the neural mechanism for sleep’s bias-shifting effect is unclear.
• What they did: Participants learned positive, negative, or neutral face-outcome pairings, then completed immediate and delayed generalization tests after sleep or wakefulness; fMRI and high-density EEG related outcome-processing and sleep-spindle activity to individual differences.
• The result: Amygdala and limbic activity during outcome-processing predicted stronger immediate negative generalization and a sleep-specific shift toward positive generalization, and sleep-spindle activity correlated with post-sleep increases in positive generalization and reductions in negative generalization.

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