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van Ginkel, G.J. (author), van Gisbergen, Bart (author), Redig, F.H.J. (author)We study a model of active particles that perform a simple random walk and on top of that have a preferred direction determined by an internal state which is modelled by a stationary Markov process. First we calculate the limiting diffusion coefficient. Then we show that the ‘active part’ of the diffusion coefficient is in some sense maximal...journal article 2021