Neurophysiologic evidence for increased retrieval suppression among negative ruminators

Autor: Aarti Nair, Joshua C. Eyer, Mark E. Faust
Rok vydání: 2019
Předmět:
Zdroj: Brain and Behavior
Brain and Behavior, Vol 10, Iss 9, Pp n/a-n/a (2020)
ISSN: 2162-3279
Popis: Introduction Events (e.g., seeing a familiar face) may initiate retrieval of associated information (e.g., person's name), but not all cue‐initiated memory retrieval is welcome (e.g., trauma). Retrieval suppression refers to the ability to halt unwanted retrieval, and any erosion of memory associations in response to repeatedly excluding a memory from consciousness. The current study sought to examine event‐related potential (ERP, averaged scalp electrical recordings) correlates of inhibitory cognitive control of memory retrieval and any linkage of such control to ruminative memory styles. Methods Participants (N = 23) first learned face‐picture pairings. ERPs were then recorded as they viewed face cues while either bringing the associated picture to mind (think trial), or not allowing the associated picture to come to mind (no‐think trial). Results Emotional valence of learned pictures (negative versus neutral) modulated a posterior (P1, 100–150 ms) ERP associated with attention to the face cue. Memory strategy (think versus no‐think) modulated a frontal (P3, 350–450 ms) associated with alerting of the need to control retrieval. Both valence and strategy worked in combination to modulate a late posterior (LC, 450–550 ms) ERP associated with successful memory retrieval. Brooding, a negative form of rumination, was found to be positively correlated with the LC ERP. Conclusion The results suggest early separation of emotional and strategic control of retrieval, but later combined control over access to working memory. Moreover, the positive correlation of brooding and the LC suggest that individuals who are high in application of perseverative strategies to memory retrieval will show greater modulation of the retrieval‐related LC ERP.
Most individuals are able to keep unwanted memories out of everyday consciousness to get through their daily activities. This adaptable control process helps us manage our emotional memories. However, this process may be disrupted in individuals experiencing psychiatric conditions characterized by intrusive ruminative thoughts, such as post‐traumatic stress disorder. Here, we use electroencephalography techniques to demonstrate that our participants are able to successfully learn to suppress negative stimuli. Our findings suggest that there may be potential ways to enhance retrieval suppression mechanisms for individuals with psychiatric conditions before their symptoms become debilitating.
Databáze: OpenAIRE
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