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Separable neural mechanisms support intentional forgetting and thought substitution
Cortex ( IF 3.6 ) Pub Date : 2021-07-13 , DOI: 10.1016/j.cortex.2021.06.013
Ryan J Hubbard 1 , Lili Sahakyan 2
Affiliation  

Psychological and neuroscientific experiments have established that people can intentionally forget information via different strategies: direct suppression and thought substitution. However, few studies have directly compared the effectiveness of these strategies in forgetting specific items, and it remains an open question if the neural mechanisms supporting these strategies differ. Here, we developed a novel item-method directed forgetting paradigm with Remember, Forget, and Imagine cues, and recorded EEG to directly compare these strategies. Behaviorally, Forget and Imagine cues produced similar forgetting compared to Remember cues, but through separable neural processes; Forget cues elicited frontal oscillatory power changes that were predictive of future forgetting, whereas item-cue representational similarity was predictive of later accuracy for Imagine cues. These results suggest that both strategies can lead to intentional forgetting, but directed forgetting may rely on frontally-mediated suppression, while thought substitution may lead to contextual shifting, impairing successful retrieval.



中文翻译:

可分离的神经机制支持有意遗忘和思想替代

心理学和神经科学实验已经证实,人们可以通过不同的策略有意地忘记信息:直接抑制和思想替代。然而,很少有研究直接比较这些策略在忘记特定项目方面的有效性,并且支持这些策略的神经机制是否不同仍然是一个悬而未决的问题。在这里,我们开发了一种新颖的项目方法定向遗忘范式,其中包含记住、忘记和想象提示,并记录 EEG 以直接比较这些策略。在行为上,Forget 和Imagine 线索与Remember 线索相比产生了类似的遗忘,但通过可分离的神经过程;遗忘线索引发了可预测未来遗忘的额叶振荡功率变化,而 item-cue 表示相似性可以预测 Imagine 线索的后期准确性。这些结果表明,这两种策略都可能导致有意遗忘,但定向遗忘可能依赖于正面介导的抑制,而思想替代可能导致上下文转换,从而影响成功检索。

更新日期:2021-08-01
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