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| Abstract: |
| To simulate the firing pattern of biological grid cells, this paper presents an improved computational model of grid cells based on column structure. In this model, the displacement along different directions is processed by modulus operation, and the obtained remainder is associated with firing rate of grid cell. Compared with the original model, the improved parts include that: the base of modulus operation is changed, and the firing rate in firing field is encoded by Gaussian-like function. Simulation validates that the firing pattern generated by the improved computational model is more consistent with biological characteristic than original model. Besides, the firing pattern is badly influenced by the cumulative positioning error, but the computational model can also generate the regularly hexagonal firing pattern when the real-time positioning results are modified |
| Key words: grid cells firing pattern bionic navigation |
| DOI：10.11916/j.issn.1005-9113.2016.03.004 |
| Clc Number:TP391 |
| Fund: |
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| Descriptions in Chinese: |
| 在动物导航过程中，网格细胞的放电与动物空间转换有关。当网格细胞的放电机理应用于运行体导航时，首先需要解决的问题是网格细胞放电样式的模拟。本文提出一种改进的柱状结构下网格细胞计算模型。相对原模型，该模型改进的内容包括：一是改变了模数运算的基数；二是，采用高斯状的函数对放电野中网格细胞的放电率进行了编码。仿真结果表明，改进的模型比原模型更能模拟生物网格细胞的放电特性，同时发现，产生的放电样式易受累积定位误差的影响，但是当实时定位结果得到修正时，该计算模型仍能产生规则的等边六边形放电样式。 |
