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A theory for the formation of episodic memory in terms of Cantor coding

康托编码情景记忆形成理论

基本信息

批准号：
12834001
负责人：
TSUDA Ichiro
金额：
$ 2.56万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12834001/
关键词：
hippocampus episodic memory chaotic itinerancy Cantor set Cantor coding chaotic dynamical systems complex systems θ波 γ波カントールコーディングカオス

项目摘要

It is known that hippocampus works to form series of events that is, episodic memory. We investigate the problem of formation of episodic memory from complex systems point of view. Our purpose is to understand the mechanism of formation of episodic memory leased on high-dimensional dynamical systems theory.In these two years of the project, we proposed a dynamic model of formation of epicodic memory. Human experience can be explained as a result that consciousness discretises continuous external phenomenon. We set up a hypothesis that gamma wave executes this discretization process. The hippocampus-cortical system synchronizes with theta rhythms with recurrence time in about 200 milliseconds. The discretization of theta wave by gamma wave can be regarded as input series of events to hippocampus. We show that chaotic itinerancy represents the transition of memory, based on the network structures of GA3. Schaeffer collaterals of the pyramidal cells in CA3 send input signal toCA1, which gives rise to a stable dynamical systems, Thus CA3-CA1 system is described as a contracting dynamics driven by chaotic itinerancy.It is expected that Cantor sets are organized in GA1 region according to a standard theory of contracting maps. We show the existence of such attractors with computer simulations. The chaotic itinerancy in CA3 represents a series of events, namely episode, while the hierarchy of Cantor attractor in CA1 represents a history of chaotic itinerancy. Thus it turns out that Cantor sets implies categories of episode.

众所周知，海马体的作用是形成一系列事件，即情景记忆。我们从复杂系统的角度研究情景记忆的形成问题。本研究的目的是从高维动力系统理论的角度来理解情景记忆的形成机制，在这两年的研究中，我们提出了一个情景记忆形成的动力学模型。人类经验可以解释为意识离散化连续的外部现象的结果。我们建立了一个假设，伽玛波执行这个离散化过程。海马-皮层系统以θ节律重复，重复时间约为200毫秒。γ波对θ波的离散化可以看作是海马的一系列输入事件。我们表明，混沌巡回表示的过渡记忆，基于网络结构的GA 3。CA 3锥体细胞的Schaeffer侧支向CA 1发送输入信号，产生一个稳定的动力学系统，从而将CA 3-CA 1系统描述为一个混沌巡游驱动的收缩动力学系统，并根据收缩映射的标准理论，将CA 3-CA 1区域的Cantor集组织起来。我们通过计算机模拟证明了这种吸引子的存在。CA 3中的混沌巡游表示一系列事件，即情节，而CA 1中的Cantor吸引子的层次结构表示混沌巡游的历史。因此，它证明了康托集意味着类别的插曲。