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. 2020 May 12;11:674. doi: 10.3389/fphar.2020.00674

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Copyright © 2020 Rojas-Carvajal, Sequeira-Cordero and Brenes

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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Kinetics of ultrasonic vocalizations in the environmental enrichment cage. Total number of 50-kHz calls (A) over minutes (left panel), weeks (middle panel), and its cumulative average (right panel). Fifty-kHz calls' subtypes (B) and their respective exemplary sonograms. (C) Data correspond to frequencies (A) and percentages (B) expressed as mean ± SEM. CEE, continuous environmental enrichment; REE, restricted and unpredictable environmental enrichment. Single, pairwise-comparisons between groups: ***p < .001.