Table 4 Results of simple effect analysis for the amplitudes of LPC for the stimulus group and stimulus type

	F	P	partial η²	Bonferroni
Stimulus type \|TS	10.476	0.001^*	0.826	OCP > OC,OQ,OW,OWP; OC > OQ; OQP > OQ,OW
Stimulus type \|CS	5.155	0.011^*	0.701	OCC,OCPC > OWC
Stimulus group \|OC	0.437	0.519	0.028	NA
Stimulus group \|OCP	50.347	0.000^**	0.770	TS > CS
Stimulus group \|OQ	7.132	0.017^*	0.322	CS > TS
Stimulus group \|OQP	5.633	0.031^*	0.273	TS > CS
Stimulus group \|OW	0.208	0.655	0.014	NA
Stimulus group \|OWP	0.320	0.580	0.021	NA

The symbol “>” indicates that the amplitudes on the left side of “>” are significantly greater than those on the right side. The symbols “|” denote the conditions on the left side of “|” under the conditions on the right side of “|”. The F-value from the analysis of variance (ANOVA) is denoted as F. The effect size for ANOVA is represented by partial η². NA signifies that the information is not applicable. Additionally, OC refers to the original advertisement call with six notes; OCP represents the rising intonation version of OC, where the pitch of the sixth note was increased by 15%; OQ indicates modified version of OC, where the sixth note was replaced by the sixth note of an advertisement call from a sympatric anuran species, Quasipaa boulengeri; OQP represents the rising intonation version of OQ, with a 15% increase in the pitch of the sixth component; OW denotes the altered version of OC, with the last note replaced by white noise; and OWP represents the rising intonation version of OW, with a 15% pitch increase in the last component. The control stimuli for OC, OCP and OW are denoted as OCC, OCPC and OWC respectively, where the first five notes of each treatment stimulus were reversed in situ while the last component remained unchanged. In addition, CS and TS refer to the control and treatment stimuli, respectively. *p < 0.05 and **p < 0.001.

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