Distinct contributions of the fornix and inferior longitudinal fasciculus to episodic and semantic autobiographical memory.

Distinct contributions of the fornix and inferior longitudinal fasciculus to episodic and semantic autobiographical memory.
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前堡和下纵向筋膜对情节和语义自传记忆的独特贡献。

DOI:
10.1016/j.cortex.2017.05.010
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发表时间:
2017-09
期刊:
Cortex; a journal devoted to the study of the nervous system and behavior
影响因子:
--
通讯作者:
Graham KS
Graham KS
中科院分区:
其他
文献类型:
--
作者:
Hodgetts CJ;Postans M;Warne N;Varnava A;Lawrence AD;Graham KS

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自传体记忆(AM)是多方面的,结合了对上下文细节的生动检索(情景AM),以及将意义和连贯性注入过去事件的语义知识(语义AM)。虽然神经心理学证据强调海马和前颞叶 (ATL) 分别在情景 AM 和语义 AM 中发挥作用,但尚不清楚它们是否构成可分离的大规模 AM 网络。我们使用高角分辨率扩散加权成像和基于约束球面解卷积的纤维束成像技术来评估 27 名健康年轻成人参与者的白质微观结构,这些参与者被要求使用单词线索回忆过去的经历。穹窿(主要海马输入/输出通路)微观结构的个体间差异与 AM 中情景细节的数量有关,但与语义细节无关——与记忆年龄无关。相反,连接枕颞区和 ATL 的下纵束的微观结构与语义 AM 相关,但与情景 AM 无关。此外,当分别控制海马和 ATL 灰质体积时,这些显着的相关性仍然存在。这种惊人的相关性双重解离支持了这样一种观点,即独特的大规模分布式脑回路支撑着 AM 的背景和概念。
Autobiographical memory (AM) is multifaceted, incorporating the vivid retrieval of contextual detail (episodic AM), together with semantic knowledge that infuses meaning and coherence into past events (semantic AM). While neuropsychological evidence highlights a role for the hippocampus and anterior temporal lobe (ATL) in episodic and semantic AM, respectively, it is unclear whether these constitute dissociable large-scale AM networks. We used high angular resolution diffusion-weighted imaging and constrained spherical deconvolution-based tractography to assess white matter microstructure in 27 healthy young adult participants who were asked to recall past experiences using word cues. Inter-individual variation in the microstructure of the fornix (the main hippocampal input/output pathway) related to the amount of episodic, but not semantic, detail in AMs – independent of memory age. Conversely, microstructure of the inferior longitudinal fasciculus, linking occipitotemporal regions with ATL, correlated with semantic, but not episodic, AMs. Further, these significant correlations remained when controlling for hippocampal and ATL grey matter volume, respectively. This striking correlational double dissociation supports the view that distinct, large-scale distributed brain circuits underpin context and concepts in AM.
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