Additional file 9.

The same cavefish in the same arena, after two of the landmarks had been switched (test trial), changing their order. Note how much faster the fish is swimming in the test trial than in the control, indicating that it had recognized a change in its environment. Movie provided by T Burt de Perera.

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Ghysen et al. Neural Development 2007 2:15   doi:10.1186/1749-8104-2-15