Hippocampal "time cells": time versus path integration.

Hippocampal "time cells": time versus path integration.
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DOI:
10.1016/j.neuron.2013.04.015
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发表时间:
2013-06-19
期刊:
影响因子:
16.2
通讯作者:
Hasselmo ME
Hasselmo ME
中科院分区:
医学1区
文献类型:
--
作者:
Kraus BJ;Robinson RJ 2nd;White JA;Eichenbaum H;Hasselmo ME

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最近的研究报告了海马区“时间细胞”的存在,这种神经元在行为和位置相对恒定的特定时刻放电。然而,对明显的时间编码的另一种解释是,海马神经元“整合路径”来编码动物走过的距离。在这里,当大鼠在跑步机上原地跑步时,我们检测了海马神经元的放电模式,从而“夹住”了行为和位置,同时我们改变了跑步机的速度,以区分经过的时间和行驶的距离。海马神经元受到时间和距离的强烈影响,而不是受位置的微小变化的影响。此外,不同神经元的活动不同程度地反映了整合随时间和距离的变化,大多数神经元受到这两个因素的强烈影响,有些仅受时间或距离的显著影响。因此,海马神经元网络捕捉到了时间和距离的组织,在这些维度主导着正在进行的体验的情况下。
Recent studies have reported the existence of hippocampal “time cells,” neurons that fire at particular moments during periods when behavior and location are relatively constant. However, an alternative explanation of apparent time coding is that hippocampal neurons “path integrate” to encode the distance an animal has traveled. Here, we examined hippocampal neuronal firing patterns as rats ran in place on a treadmill, thus “clamping” behavior and location, while we varied the treadmill speed to distinguish time elapsed from distance traveled. Hippocampal neurons were strongly influenced by time and distance, and less so by minor variations in location. Furthermore, the activity of different neurons reflected integration over time and distance to varying extents, with most neurons strongly influenced by both factors and some significantly influenced by only time or distance. Thus, hippocampal neuronal networks captured both the organization of time and distance in a situation where these dimensions dominated an ongoing experience.
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