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Circuit Mechanisms Underlying Chromatic Encoding in Drosophila Photoreceptors.
Current Biology ( IF 8.1 ) Pub Date : 2020-01-09 , DOI: 10.1016/j.cub.2019.11.075
Sarah L Heath 1 , Matthias P Christenson 1 , Elie Oriol 1 , Maia Saavedra-Weisenhaus 1 , Jessica R Kohn 1 , Rudy Behnia 2
Affiliation  

Spectral information is commonly processed in the brain through generation of antagonistic responses to different wavelengths. In many species, these color opponent signals arise as early as photoreceptor terminals. Here, we measure the spectral tuning of photoreceptors in Drosophila. In addition to a previously described pathway comparing wavelengths at each point in space, we find a horizontal-cell-mediated pathway similar to that found in mammals. This pathway enables additional spectral comparisons through lateral inhibition, expanding the range of chromatic encoding in the fly. Together, these two pathways enable efficient decorrelation and dimensionality reduction of photoreceptor signals while retaining maximal chromatic information. A biologically constrained model accounts for our findings and predicts a spatio-chromatic receptive field for fly photoreceptor outputs, with a color opponent center and broadband surround. This dual mechanism combines motifs of both an insect-specific visual circuit and an evolutionarily convergent circuit architecture, endowing flies with the ability to extract chromatic information at distinct spatial resolutions.

中文翻译:

果蝇感光体中色编码基础的电路机制。

光谱信息通常在大脑中通过产生对不同波长的拮抗反应来处理。在许多物种中,这些颜色对立信号最早出现在感光末端。在这里,我们测量果蝇中感光器的光谱调谐。除了前面描述的比较空间中每个点波长的途径外,我们还发现了一种水平细胞介导的途径,与哺乳动物相似。该途径可通过横向抑制实现额外的光谱比较,从而动态扩展了彩色编码的范围。这两个途径共同实现了感光信号的有效去相关和降维,同时保留了最大的色度信息。生物约束模型解释了我们的发现,并预测了苍蝇感光器输出的时空色接收场,并带有颜色对手中心和宽带环绕声。这种双重机制结合了昆虫专用视觉电路和进化收敛电路结构的图案,赋予果蝇以不同的空间分辨率提取色彩信息的能力。
更新日期:2020-01-09
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