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The stimulus set

Stimuli were natural and modified versions of sounds from the Cornel Laboratory of Ornithology ©. For detailed methods, see [1]. All stimuli had a similar frequency distribution, with a peak near 4 kHz, duration of about 100 ms and the fluctuations in the temporal envelope were below 100 Hz. Figure 1 in the main text presents the spectrograms of all 15 stimuli.