Transformation of Polarized Light Information in the Central Complex of the Locust
Transformation of Polarized Light Information in the Central Complex of the Locust
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DOI：
10.1523/jneurosci.1870-09.2009
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发表时间：
2009-09-23
影响因子：
5.3
通讯作者：
Homberg, Uwe
中科院分区：
文献类型：
--
作者：
Heinze, Stanley;Gotthardt, Sascha;Homberg, Uwe
许多昆虫感知偏振天空光的E矢量方向，并利用它进行罗盘导航。在蝗虫中，偏振光被眼睛背缘区域的光感受器检测到。来自双眼的偏振光信号被整合到中央复合体（CC）中，这是大脑中心的一组神经末梢。13种CC神经元对背侧呈现的偏振光敏感（POL神经元）。这些神经元将CC的细分，特别是前脑桥（PB），中央体的上下分区（CBU，CBL）和相邻的外侧副叶（LAL）相互连接。所有的POL神经元都表现出极化抑制，即，在正交E向量方向上接收兴奋性和抑制性输入。为了给CC中极化视觉网络的信息流方向提供生理学证据，我们通过细胞内记录分析了不同细胞类型的功能特性。CBL的切向神经元表现出最高的信噪比，只接受同侧偏振光输入，或者与CL1柱状神经元一起接受偏心感受野。两侧偏振光输入与天顶为中心的感受野被发现在PB的切线神经元和柱状神经元投射到LAL。与其他生理参数一起，这些数据表明从CBL（输入）到PB以及从PB到LAL（输出）的信息流。该方案得到解剖数据的支持，并建议在CC输入阶段将纯感觉E矢量编码转换为输出阶段的360度罗盘方向的位置不变编码。
Many insects perceive the E-vector orientation of polarized skylight and use it for compass navigation. In locusts, polarized light is detected by photoreceptors of the dorsal rim area of the eye. Polarized light signals from both eyes are integrated in the central complex ( CC), a group of neuropils in the center of the brain. Thirteen types of CC neuron are sensitive to dorsally presented, polarized light (POL-neurons). These neurons interconnect the subdivisions of the CC, particularly the protocerebral bridge (PB), the upper and lower divisions of the central body (CBU, CBL), and the adjacent lateral accessory lobes (LALs). All POL-neurons show polarization-opponency, i.e., receive excitatory and inhibitory input at orthogonal E-vector orientations. To provide physiological evidence for the direction of information flow through the polarization vision network in the CC, we analyzed the functional properties of the different cell types through intracellular recordings. Tangential neurons of the CBL showed highest signal-to-noise ratio, received either ipsilateral polarized-light input only or, together with CL1 columnar neurons, had eccentric receptive fields. Bilateral polarized-light inputs with zenith-centered receptive fields were found in tangential neurons of the PB and in columnar neurons projecting to the LALs. Together with other physiological parameters, these data suggest a flow of information from the CBL ( input) to the PB and from here to the LALs ( output). This scheme is supported by anatomical data and suggests transformation of purely sensory E-vector coding at the CC input stage to position-invariant coding of 360 degrees-compass directions at the output stage.