标题： 光趋性决策行为的微藻 显示英文标题

标题： Phototactic Decision-Making by Micro-Algae

摘要： 我们研究了简单的真核生物在光趋性背景下如何对竞争性刺激做出决策，这是由单细胞藻类$Chlamydomonas~reinhardtii$进行的。 虽然负向光趋性的细胞会直接远离一束准直光束，但当提供两个可调节交叉角度和强度的光束时，我们发现细胞游动的方向是由两个光传播矢量的强度加权平均给出的。 这个几何定律是光趋性自适应模型的一个不动点，并且最小化了落在细胞前极上的平均光强。 在大角度分离的情况下，细胞亚群会远离一个光源或另一个光源，或者沿着几何定律的方向游动，其中一些细胞会在三个方向之间随机切换。 这种行为被证明来源于光感受器位置的群体水平分布，该分布打破了光感受的前后对称性。 显示英文摘要

摘要： We study how simple eukaryotic organisms make decisions in response to competing stimuli in the context of phototaxis by the unicellular alga $Chlamydomonas~reinhardtii$. While negatively phototactic cells swim directly away from a collimated light beam, when presented with two beams of adjustable intersection angle and intensities, we find that cells swim in a direction given by an intensity-weighted average of the two light propagation vectors. This geometrical law is a fixed point of an adaptive model of phototaxis and minimizes the average light intensity falling on the anterior pole of the cell. At large angular separations, subpopulations of cells swim away from one source or the other, or along the direction of the geometrical law, with some cells stochastically switching between the three directions. This behavior is shown to arise from a population-level distribution of photoreceptor locations that breaks front-back symmetry of photoreception.