A hippocampal model for episodic memory using neurogenesis and asymmetric STDP
A hippocampal model for episodic memory using neurogenesis and asymmetric STDP
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DOI：
10.1109/ijcnn.2016.7727885
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发表时间：
2016-07
期刊：
影响因子：
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通讯作者：
M. Hattori;Yoshinori Kobayashi
中科院分区：
文献类型：
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作者：
M. Hattori;Yoshinori Kobayashi
我们的记忆首先是作为对个人事件的记忆(情节记忆)获得的。然后，它的时间语境被移除，所产生的记忆被用于更高阶的信息处理，如思维、推理等。因此，情节记忆是我们记忆的基础。在本文中，我们提出了一种情景记忆模型，该模型采用了海马体的生理发现。情节记忆可以被认为是一个时间序列的模式。通常，这样的序列可以具有在其中多次出现的一些模式，或者多个时间序列可以彼此共享一些相同的模式。也就是说，情景记忆模型对于处理一对多的关联和上下文是必不可少的。在所提出的模型中，齿状回(DG)的神经发生有助于在CA3中为相同的输入模式建立不同的表征，并促进一对多的联系。此外，不对称的棘波时序依赖的突触可塑性被引入CA3区的反复侧支的学习中，从而实现了对上下文的记忆。计算机仿真结果表明，该模型能够处理复杂的时间序列。
Our memory is first acquired as memory of a personal event (episodic memory). Then, its temporal context is removed and the resultant memory is used in higher-order information processing, such as thinking, reasoning and so on. Therefore, episodic memory is the basis of our memories. In this paper, we propose an episodic memory model which adopts the physiological findings of the hippocampus. Episodic memory can be regarded as a temporal sequence of patterns. In general, such a sequence may have some patterns which appear several times in it, or plural temporal sequences may share some same patterns with each other. That is, it is indispensable for the episodic memory model to handle one-to-many association and context. In the proposed model, the neurogenesis in dentate gyrus (DG) contributes to build different representations in CA3 for the same input patterns, and facilitates one-to-many association. Moreover, the asymmetric spike timing dependent synaptic plasticity introduced to the learning of recurrent collateral in CA3 enables memory of context. Computer simulation results show that the proposed model can deal with complex temporal sequences.