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. 2013 Mar 21;9(3):e1002961. doi: 10.1371/journal.pcbi.1002961

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© 2013 Mann et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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At any point in time the prawn is in a state of either CW or anti-CW orientation. The precise state is hidden but we make observations , the actual frame-by-frame movements of the prawn, which give information about the relative probabilities of the two states. We assume a fixed probability of transition between the states which is inferred from the data and allows for the persistence of orientation over time.

Inline graphic — At any point in time the prawn is in a state of either CW or anti-CW orientation. The precise state is hidden but we make observations , the actual frame-by-frame movements of the prawn, which give information about the relative probabilities of the two states. We assume a fixed probability of transition between the states which is inferred from the data and allows for the persistence of orientation over time.