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Fig. 7. The angular difference between the reference e-vector and the comparison e-vector ({Delta} e-vector) is plotted against the percentage of choice frequency for each fish. Each point represents the percentage of correct choice frequency (mean ± S.E.M.) between the reference e-vector and the comparison e-vector (40 trials per fish, N=4). The horizontal shaded bands represent the range of choice frequency values that correspond to significance levels of P=0.001≤x, P=0.01≤x≤0.001 and P=0.05≤x≤0.01, calculated using the binomial probability function for 40 Bernoulli trials. The smallest {Delta} e-vector was approximately 25° in all four fish.