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Conceptual model for C. eleganschemotaxis. Attractant concentrationC(t) modulates pirouette probabilityP[q(t)] by a three-stage process involving differentiation, low-pass filtering, and a nonlinearity that maps filter outputq(t) to pirouette probabilityP[q(t)]. Note that the order of the first two stages of processing could be reversed if the biological system is approximately linear.
