Increased hippocampus to ventromedial prefrontal connectivity during the construction of episodic future events.

Increased hippocampus to ventromedial prefrontal connectivity during the construction of episodic future events.
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在情节未来事件的构建过程中,海马增加到腹侧前额叶连通性。

DOI:
10.1002/hipo.22812
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发表时间:
2018-03
期刊:
影响因子:
3.5
通讯作者:
Schacter DL
Schacter DL
中科院分区:
医学3区
文献类型:
--
作者:
Campbell KL;Madore KP;Benoit RG;Thakral PP;Schacter DL

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海马体和腹内侧前额叶皮质(VmPFC)似乎对未来的情景模拟至关重要。任何一种结构的损坏都会影响一个人记忆过去和想象未来的能力,在未来的模拟过程中,这两种结构通常作为更广泛的核心网络的一部分被激活。然而,在情节模拟过程中,这些结构中的每一个所扮演的确切角色,以及它们之间的信息流的方向,仍然没有被很好地理解。在这项研究中,我们使用功能磁共振成像(FMRI)对参与者进行扫描,同时他们想象未来的事件对对象线索的反应。然后,我们使用动态因果模型(DCM)来检查在事件的初始心理构建期间左侧前海马和vmPFC之间的有效连接。我们的结果表明,虽然这些区域之间存在很强的双向内在连接(即与任务条件无关),但在构建情景未来事件的过程中,只有海马体到vmPFC的连接增加,这表明海马体启动事件模拟以响应提取线索,驱动vmPFC中的激活,其中情景细节可能进一步整合。
Both the hippocampus and ventromedial prefrontal cortex (vmPFC) appear to be critical for episodic future simulation. Damage to either structure affects one’s ability to remember the past and imagine the future, and both structures are commonly activated as part of a wider core network during future simulation. However, the precise role played by each of these structures and, indeed, the direction of information flow between them during episodic simulation, is still not well understood. In this study, we scanned participants using functional magnetic resonance imaging (fMRI) while they imagined future events in response to object cues. We then used dynamic causal modeling (DCM) to examine effective connectivity between the left anterior hippocampus and vmPFC during the initial mental construction of the events. Our results show that while there is strong bidirectional intrinsic connectivity between these regions (i.e., irrespective of task conditions), only the hippocampus to vmPFC connection increases during the construction of episodic future events, suggesting that the hippocampus initiates event simulation in response to retrieval cues, driving activation in the vmPFC where episodic details may be further integrated.
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发表时间: 2017-05
期刊: Cortex; a journal devoted to the study of the nervous system and behavior
影响因子: --
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通讯作者: Schacter DL
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