Network-wide abnormalities explain memory variability in hippocampal amnesia

Network-wide abnormalities explain memory variability in hippocampal amnesia
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网络范围的异常解释了海马失忆症的记忆变异性

DOI:
10.1101/551812
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发表时间:
2019
期刊:
--
影响因子:
--
通讯作者:
Argyropoulos G
Argyropoulos G
中科院分区:
--
文献类型:
--
作者:
Argyropoulos G

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海马遗忘症患者在记忆神经科学中扮演着核心角色,但遗忘症的神经基础是激烈争论的。我们假设局灶性海马损伤与扩展海马系统的变化有关,而不是海马萎缩本身,可以解释患者之间记忆的差异。我们在一个独特的大队列的患者(n = 38)后,自身免疫性边缘系统脑炎,与局灶性结构海马病理综合征评估这一假设。这些患者表现出对新信息的回忆、识别和维持能力受损,以及远程自传体遗忘症。除海马萎缩外,我们还观察到丘脑和内嗅皮质体积、静息状态下海马间连接和后内侧皮质活动的相关减少。海马体积与回忆、再认和远程记忆的关联完全由更广泛的网络异常介导,并且仅在遗忘中直接。网络异常可以解释健忘症研究中的差异性,也可以解释记忆神经科学中的争论。
Patients with hippocampal amnesia play a central role in memory neuroscience but the neural underpinnings of amnesia are hotly debated. We hypothesized that focal hippocampal damage is associated with changes across the extended hippocampal system and that these, rather than hippocampal atrophy per se, would explain variability in memory between patients. We assessed this hypothesis in a uniquely large cohort of patients (n = 38) after autoimmune limbic encephalitis, a syndrome associated with focal structural hippocampal pathology. These patients showed impaired recall, recognition and maintenance of new information, and remote autobiographical amnesia. Besides hippocampal atrophy, we observed correlatively reduced thalamic and entorhinal cortical volume, resting-state inter-hippocampal connectivity and activity in posteromedial cortex. Associations of hippocampal volume with recall, recognition, and remote memory were fully mediated by wider network abnormalities, and were only direct in forgetting. Network abnormalities may explain the variability across studies of amnesia and speak to debates in memory neuroscience.
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