Fig. 2: Means of N1, P2, and P3a amplitudes in response to different stimulations.

Each asterisk indicates significant differences in amplitudes for a given ERP component between acoustic stimuli (n = 16 biologically independent animals; p < 0.05; two-way repeated measures ANOVA). Abbreviation: ND, call of N. daunchina; NH, call of N. hainanensis; NO, call of N. okinavana; NA, call of N. adenopleura; NL, call of N. lini.