Evidence for a gradient within the medial temporal lobes for flexible retrieval under hierarchical task rules.

Evidence for a gradient within the medial temporal lobes for flexible retrieval under hierarchical task rules.
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在分层任务规则下,内侧颞叶内的梯度用于灵活检索的证据。

DOI:
10.1002/hipo.23365
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发表时间:
2021-09
期刊:
影响因子:
3.5
通讯作者:
Stern CE
Stern CE
中科院分区:
医学3区
文献类型:
--
作者:
Brown TI;He Q;Aselcioglu I;Stern CE

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记忆研究中的一个基本问题是,海马体是如何处理上下文线索来检索不同的记忆联系的。先前的研究已经强调了海马体-前额叶相互作用对上下文相关记忆的重要性。我们的fMRI研究考察了当提取与分层组织的任务背景相关的记忆时,人类内侧颞叶(MTL)及其前额叶的相互作用。参与者学习了由下级和上级任务规则管理的虚拟物体-位置关联,这些规则可以独立地提示改变。在每个fMRI试验中,参与者检索到正确的对象以获取收敛规则和位置上下文信息。结果表明,在不同层次的层级组织任务规则下,海马区活动和海马区-前额叶功能互联性区分了提取。与海马尾部形成鲜明对比的是,前部(身体和头部)区域被专门招募来应对上下文层次结构中的上层变化。海马体在其与前额叶皮质的功能连接上也不同,以进行上级和下级的变化。我们的发现表明,在不断变化的任务规则下,联想提取的MTL存在梯度,并促进了对支持灵活上下文记忆的海马-前额叶相互作用的理解。
A fundamental question in memory research is how the hippocampus processes contextual cues to retrieve distinct mnemonic associations. Prior research has emphasized the importance of hippocampal–prefrontal interactions for context-dependent memory. Our fMRI study examined the human medial temporal lobes (MTL) and their prefrontal interactions when retrieving memories associated with hierarchically organized task contexts. Participants learned virtual object-location associations governed by subordinate and superordinate task rules, which could be independently cued to change. On each fMRI trial, participants retrieved the correct object for convergent rule and location contextual information. Results demonstrated that hippocampal activity and hippocampal–prefrontal functional interconnectivity distinguished retrieval under different levels of hierarchically organized task rules. In explicit contrast to the hippocampal tail, anterior (body and head) regions were recruited specifically for superordinate changes in the contextual hierarchy. The hippocampal body also differed in its functional connectivity with the prefrontal cortex for superordinate versus subordinate changes. Our findings demonstrate a gradient in MTL for associative retrieval under changing task rules, and advance understanding of hippocampal–prefrontal interactions that support flexible contextual memory.
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