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. 2022 Jul 14;16:883353. doi: 10.3389/fnbeh.2022.883353

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Copyright © 2022 Premoli, Petroni, Bulthuis, Bonini and Pietropaolo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Examples of ultrasonic call types used to classify USVs in the study. The call types were automatically classified using the software Sonotrack and based on the parameters described above. Definitions of the call types were mutually exclusive. Overlap of components was removed when more than 70 % to prevent wrong call durations. Short gaps between components in both frequency (≤6 kHz) and time (≤ms) were interpolated (gaps can be caused by changes in microphone sensitivity or direction of vocalization). Complex “3 component” and “+3 component” calls were summed up into a “complex tot” category.