Effects of cognitive reappraisal on directed forgetting of negative emotional memory: an ERP study

This study aimed to adopt the item-method directed forgetting (DF) paradigm to explore the effects of cognitive reappraisal on intentional forgetting of negative emotional pictures. Behavioral results showed that the recognition of to-be-forgotten but remembered (TBF-r) was significantly greater than that of to-be-remembered and remembered (TBR-r) in the recognition test, which was the opposite result to the DF effect. Event-related potential (ERP) results showed that in the 450-660 ms (ms) of cue presentation, the F-cue of the cognitive reappraisal condition (imagining the upcoming pictures to be "fake or performed by actors" to avoid or reduce the intensity of negative emotions caused by the pictures) elicited more positive late positive potential (LPP) than passive viewing (participants watched freely and paid attention to the characters, scenes, and other details in the picture). This indicated that cognitive reappraisal required stronger inhibition than passive viewing for the to-be- forgotten (TBF) items. In the test phase, both the TBR-r and TBF-r items in the cognitive reappraisal condition evoked more positive ERP than correctly rejected (CR) unseen items in the study phase, which induced the frontal old/new effect (P200, 160-240 ms). In addition, this study also found that the LPP amplitudes of 450-660 ms in the frontal area induced by F-cues in cognitive reappraisal were significantly negatively correlated with the LPP amplitudes of 300-3500 ms induced by cognitive reappraisal instructions, and positive waves in the frontal area were significantly positively correlated with the TBF-r behavioral results. However, these results were not observed in the passive viewing group. The above results show that cognitive reappraisal enhances the retrieval ability for TBR and TBF items, and TBF-r is associated with cognitive reappraisal in the study phase and inhibitory control of F-cues.