A visual motion detection circuit suggested by Drosophila connectomics.

A visual motion detection circuit suggested by Drosophila connectomics.
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DOI:
10.1038/nature12450
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发表时间:
2013-08-08
期刊:
影响因子:
64.8
通讯作者:
--
中科院分区:
综合性期刊1区
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动物行为源于神经元回路的计算,但由于缺乏详细的突触连接图或连接组,我们对这些计算的理解受到了阻碍。例如,尽管经过半个多世纪的深入研究,昆虫视觉系统中局部运动检测的神经元实现仍然难以捉摸。在这里,我们开发了一种使用电子显微镜的半自动化管道来重建果蝇视髓质内的连接组,其中包含 379 个神经元和 8,637 个化学突触接触。通过将重建的神经元与光学显微镜中的例子进行匹配,我们将神经元分配给细胞类型,并组装了髓质重复模块的连接组。在这个模块中,我们识别了构成运动检测电路的细胞类型,并表明该电路中各个运动敏感神经元的连接与其方向选择性一致。我们的结果确定了未来功能研究的细胞目标,并证明连接组可以为神经元计算提供关键见解。
Animal behavior arises from computations in neuronal circuits, but our understanding of these computations has been frustrated by the lack of detailed synaptic connection maps, or connectomes. For example, despite intensive investigations over half a century, the neuronal implementation of local motion detection in the insect visual system remains elusive. Here, we developed a semi-automated pipeline using electron microscopy to reconstruct a connectome, containing 379 neurons and 8,637 chemical synaptic contacts, within the Drosophila optic medulla. By matching reconstructed neurons to examples from light microscopy, we assigned neurons to cell types and assembled a connectome of the medulla's repeating module. Within this module, we identified cell types constituting a motion detection circuit and showed that the connections onto individual motion-sensitive neurons in this circuit were consistent with their direction selectivity. Our results identify cellular targets for future functional investigations, and demonstrate that connectomes can provide key insights into neuronal computations.
DOI: 10.1038/nature00931
发表时间: 2002-08-22
期刊: NATURE
影响因子: 64.8
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通讯作者: Denk, W
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