Time cells in the human hippocampus and entorhinal cortex support episodic memory.

Time cells in the human hippocampus and entorhinal cortex support episodic memory.
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DOI:
10.1073/pnas.2013250117
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发表时间:
2020-11-10
影响因子:
11.1
通讯作者:
Lega B
Lega B
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Umbach G;Kantak P;Jacobs J;Kahana M;Pfeiffer BE;Sperling M;Lega B

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时间细胞是海马体和内嗅皮层中的神经元,在认知任务或体验中的特定时刻激发。虽然许多著名的记忆编码理论都将时间细胞作为记忆时间成分的来源,但它们从未在人类记录中被观察到。我们确定在记忆编码和检索的时间细胞群体在内侧颞叶的人类。此外,我们证明,在编码过程中的时间细胞提供的时间信号的稳定性影响的能力,在检索时的时间顺序记忆。时间信息的组织对于情景记忆的编码和提取至关重要。在啮齿动物的海马体和内嗅皮质中,过去十年积累的证据表明海马体中的“时间细胞”群体编码时间信息。我们使用从27名进行情景记忆任务的人类癫痫患者获得的颅内微电极记录来识别人类的时间细胞。我们发现,时间细胞的活动预测检索的记忆项目的时间组织。我们还发现了人类细胞活动增加的证据,这代表了一种互补类型的时间信息。这些发现为人类大脑中形成情景记忆所需的时间信息的表征建立了细胞机制。
Time cells are neurons in the hippocampus and entorhinal cortex that fire at specific moments within a cognitive task or experience. While many prominent theories of memory encoding offer time cells as the source of the temporal component to memory, they have never been observed in human recordings. We identify time cell populations in the medial temporal lobe of humans during memory encoding and retrieval. Further, we demonstrate that the stability of the time signal provided by time cells during encoding influences the ability to temporally order memories at time of retrieval. The organization of temporal information is critical for the encoding and retrieval of episodic memories. In the rodent hippocampus and entorhinal cortex, evidence accumulated over the last decade suggests that populations of “time cells” in the hippocampus encode temporal information. We identify time cells in humans using intracranial microelectrode recordings obtained from 27 human epilepsy patients who performed an episodic memory task. We show that time cell activity predicts the temporal organization of retrieved memory items. We also uncover evidence of ramping cell activity in humans, which represents a complementary type of temporal information. These findings establish a cellular mechanism for the representation of temporal information in the human brain needed to form episodic memories.
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