Results of simple effect analysis for the factors “channel” and “stimulus”.

Note: The symbols ‘>’ denote that the relative theta power given by the channels or stimuli on the left side of ‘>’ are significantly larger than those given by the channels or stimuli on the right side, and no significant difference exists among the channels or stimuli at the same side of ‘>’ for each case.*p0.05,#p0.1 (marginally significant). Abbreviations: F is the F-value from ANOVA; ε, the values of epsilon of Greenhouse-Geisser correction; LSD, the least-significant difference test; PR1, PR2, PR3 and PR4, the four channels; SIL, WN, LSA and HSA, the four stimuli, i.e. silence, white noise, low sexual attractive call and high sexual attractive call.