显著性记忆:记忆提取过程中分布学习对皮质区域的影响

IF 3.3 2区 医学 Q1 NEUROIMAGING
Cuihong Li, Jiongjiong Yang
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引用次数: 0

摘要

间隔学习或分布式学习是增强记忆的有效方法,特别是在长时间的记忆间隔之后,重复之间的滞后影响记忆的保留。研究表明,不同的皮层区域参与了间隔效应,但皮层区域如何参与支持记忆检索,特别是在学习间隔不同的深度学习后,在更长的间隔内,仍然不清楚。为了解决这个问题,三组参与者被要求在20分钟、1天和1个月前对面孔场景对进行编码,然后在联想识别任务中进行fMRI扫描。在三种情况下学习了六次:集中分布(ML),短滞后分布(DL-S)和长滞后分布(DL-L)。结果表明,当参与者在DL-L和DL-S条件下正确检索到对时,显著性网络(包括脑岛和扣带皮层)的激活比ML条件下更强。此外,在1个月时,DL-L组比DL-S组在正确拒绝新联想时,额下回/脑岛被更强烈地激活。1个月时,DL-L组海马与前额皮质之间的功能连通性强于DL-S组。这些结果表明,分布式学习后成功的记忆检索与负责显著性检测和自上而下控制的区域有关,特别是在长期保留方面。在深度学习之后,随着时间的推移,可以建立更显著和可控的表征,并得到分布式大脑网络的支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Salient Memory: Effects of Distributed Learning on Cortical Regions During Memory Retrieval

Salient Memory: Effects of Distributed Learning on Cortical Regions During Memory Retrieval

Spaced or distributed learning is an efficient way to enhance memory, especially after long retention intervals, and the lag between repetition influences memory retention. Studies have suggested that various cortical regions are involved in the spacing effect, but how the cortical regions are involved to support memory retrieval, especially at longer intervals, after DL with varying inter-study lags is still unclear. To address this issue, three groups of participants were asked to encode face–scene pairs at 20 min, 1 day, and 1 month before they were scanned by fMRI during an associative recognition task. The pairs were learned six times in three conditions: a massed (ML), distributed with a short lag (DL-S) and distributed with a long lag (DL-L). The results showed that the activation in the salience network, including the insula and cingulate cortex, was stronger when the participants retrieved the pairs correctly in the DL-L and DL-S conditions than in the ML condition. In addition, the inferior frontal gyrus/insula was more strongly activated when the new associations were correctly rejected in the DL-L than in the DL-S condition at 1 month. The functional connectivity between the hippocampus and prefrontal cortices was stronger in the DL-L than in the DL-S condition at 1 month. These results suggest that successful memory retrieval after distributed learning is associated with the regions that are responsible for salience detection and top-down control, especially at long-term retention. More salient and controlled representations could be established over time after DL and are supported by distributed brain networks.

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来源期刊
Human Brain Mapping
Human Brain Mapping 医学-核医学
CiteScore
8.30
自引率
6.20%
发文量
401
审稿时长
3-6 weeks
期刊介绍: Human Brain Mapping publishes peer-reviewed basic, clinical, technical, and theoretical research in the interdisciplinary and rapidly expanding field of human brain mapping. The journal features research derived from non-invasive brain imaging modalities used to explore the spatial and temporal organization of the neural systems supporting human behavior. Imaging modalities of interest include positron emission tomography, event-related potentials, electro-and magnetoencephalography, magnetic resonance imaging, and single-photon emission tomography. Brain mapping research in both normal and clinical populations is encouraged. Article formats include Research Articles, Review Articles, Clinical Case Studies, and Technique, as well as Technological Developments, Theoretical Articles, and Synthetic Reviews. Technical advances, such as novel brain imaging methods, analyses for detecting or localizing neural activity, synergistic uses of multiple imaging modalities, and strategies for the design of behavioral paradigms and neural-systems modeling are of particular interest. The journal endorses the propagation of methodological standards and encourages database development in the field of human brain mapping.
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