Table 1. Test stimulus used in behavioral experiments.

Test stimulus sequence	ITI (ms)	Stimulus freq. (kHz)	Notes
(i) Slow isochronous (X---X---)	400	20, 22.5, 28.4, 40.2	Target in baseline discrimination session
(ii) Fast isochronous (X-X-X-X-)	200	20	Non-target in baseline discrimination session
(iii) Galloping (XXX-XXX-)	100	20, 22.5, 28.4, 40.2	Non-target in baseline discrimination session
(iv) ABA- (ABA-ABA-)	100	A: 20; B: 22.5, 28.4, 40.2 (ΔF = 2, 6, 12 semitones)	Test stimulus in probe session