2020 Fiscal Year Annual Research Report
Relationship of color and polarization information in the butterfly lamina
| Project/Area Number |
18F18807
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| Research Institution | The Graduate University for Advanced Studies |
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Principal Investigator |
蟻川 謙太郎 総合研究大学院大学, 先導科学研究科, 教授 (20167232)
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| Co-Investigator(Kenkyū-buntansha) |
ILIC MARKO 総合研究大学院大学, 先導科学研究科, 外国人特別研究員
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| Project Period (FY) |
2018-11-09 – 2021-03-31
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| Keywords | insect / color vision / photoreceptor / lamina / lamina monopolar cell / spectral opponency / spatial opponency / modelling |
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| Outline of Annual Research Achievements |
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.
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| Research Progress Status |
令和2年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和2年度が最終年度であるため、記入しない。
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