Extended Data Fig. 1: Stimulus library of prototypical and morphed pup calls.
From: Innate and plastic mechanisms for maternal behaviour in auditory cortex
a, A set of six prototypical pup calls were selected from a library of pre-recorded calls. Prototypical calls had 4–5 syllables and an average ISI of 150–200 ms (bin: 175 ± 25 ms). Total duration of each prototype was approximately 1 s. b, Example of one prototypical call morphed in the temporal domain. Time was added or subtracted from the ISI to slow down or speed up the calls, respectively. Other features (for example, frequency content) remained the same across all temporal morphs. A set of seven morphs was generated for each prototypical call (bin centre: 75, 125, 225, 275, 375, 575 and 975 ms; bin size: ± 25 ms), resulting in a library of 42 pup call sounds. Colour indicates overall speed or duration of ISIs, with red representing faster calls with shorter ISIs, and blue representing slower calls with longer ISIs.
