Binocular integration of visual information: a model study on naturalistic optic flow processing
Binocular integration of visual information: a model study on naturalistic optic flow processing
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DOI：
10.3389/fncir.2011.00004
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发表时间：
2011-04-04
影响因子：
3.5
通讯作者：
Egelhaaf, Martin
中科院分区：
文献类型：
--
作者：
Hennig, Patrick;Kern, Roland;Egelhaaf, Martin
在解决定向和导航任务时，来自两个视觉半球的视觉信息的计算通常具有功能相关性。VCH细胞是Calliphora视觉系统中一个运动敏感的广域神经元，是光流处理领域的一个模型系统。VCH细胞接收来自各种其他识别的宽视野细胞的输入，这些细胞的感受野位于同侧和对侧视野中。这种连通性与自然图像序列的处理的相关性仍未得到解决，这些图像序列具有独特的动力学特性。为了弄清不同输入分量对细胞整体响应的贡献，我们使用Vch-cell及其各种输入元件的电生理决定的响应来调整Vch-电路的模型。它们对VCH细胞反应的影响不仅可以通过刺激苍蝇视野的扩展部分来区分，也可以通过刺激具有行为产生的光流的ipsi和对侧视野中的选定区域来区分。我们表明，VCH回路的计算模型能够解释苍蝇视觉系统中对应者的神经元活动。此外，我们提供了双眼视觉输入的树突整合的洞察力。
The computation of visual information from both visual hemispheres is often of functional relevance when solving orientation and navigation tasks. The vCH-cell is a motion-sensitive wide-field neuron in the visual system of the blowfly Calliphora, a model system in the field of optic flow processing. The vCH-cell receives input from various other identified wide-field cells, the receptive fields of which are located in both the ipsilateral and the contralateral visual field. The relevance of this connectivity to the processing of naturalistic image sequences, with their peculiar dynamical characteristics, is still unresolved. To disentangle the contributions of the different input components to the cell's overall response, we used electrophysiologically determined responses of the vCH-cell and its various input elements to tune a model of the vCH-circuit. Their impact on the vCH-cell response could be distinguished by stimulating not only extended parts of the visual field of the fly, but also selected regions in the ipsi-and contralateral visual field with behaviorally generated optic flow. We show that a computational model of the vCH-circuit is able to account for the neuronal activities of the counterparts in the blowfly's visual system. Furthermore, we offer an insight into the dendritic integration of binocular visual input.