Relationship of color and polarization information in the butterfly lamina

蝴蝶的眼睛由随机分布的三种不同类型的小眼组成。每个小眼包含9个光感受器(PR)细胞，它们在板层中形成一个称为盒的模块，其中有4个二级板层单极细胞(LMC)。在盒中，具有不同光谱敏感性的PR通过组胺门控氯离子通道连接，形成特征光谱对抗性。一些PR和LMC具有穿透相邻药筒的长侧分支，这表明可能存在空间相互作用。在这里，我们旨在通过细胞内电生理学、解剖学和建模来展示Papilio层的空间光谱对抗性。我们可以从许多(通常是50个)不同的角度记录PR的光谱敏感性，并且确实发现离轴刺激改变了敏感性曲线，表明空间光谱对抗性。我们建立了一个计算模型来分析反应，这支持了我们的假设，即复杂的对抗背后的突触相互作用。这一模型将被扩展到估计在PR和LMC中产生空间对抗的室间连接的功能。

The eye of a butterfly Papilio consists of randomly distributed three spectrally distinct types of ommatidia. Each ommatidium contains nine photoreceptors (PRs) cells, which form a module called cartridge in the lamina with four second-order lamina monopolar cells (LMCs). In the cartridge, PRs of distinct spectral sensitivities are connected via histamine-gated chloride channels, forming characteristic spectral opponency. Some PRs and LMCs have long side branches penetrating neighboring cartridges, indicating possible spatial interaction. Here we aimed at demonstrating the spatio-spectral opponency in the Papilio lamina by intracellular electrophysiology, anatomy, and modeling. We could record spectral sensitivities of PRs from many (typically 50) different angles and indeed found that off-axis stimulations altered the sensitivity profile, indicating the spatio-spectral opponency. We made a computational model to analyze the responses, which supported our hypothesis of synaptic interaction underlying the complicated opponency. This model will be extended to estimate the function of interommatidial connections that produce spatial opponency in PRs and LMCs.