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Fig. 2. Variability between trajectories. (A) Three consecutive 5-min recordings
obtained from Fish 2 during its first visit to the tank. (B) Three consecutive
5-min trajectories from Fish 5 recorded during its first visit to the tank.
Differences between Fish 2 and Fish 5 are distinct. (C) Three consecutive
5-min recordings from Fish 5 during its fifth visit to the tank. Visual
comparison of B and C suggests the presence of a high degree of
intra-individual variability, which was confirmed quantitatively with the
nonlinear measures.