Abstract
Adult mice emit many ultrasonic vocalizations (USVs) during social interaction tasks, but only a few studies have yet reported USVs in stressed adult mice. Our aim was to study which experimental conditions favor USV emission during behaviors associated with different emotional states. As USVs likely mediate social communication, we hypothesized that temporary social isolation followed by exposure to a novel social congener would promote USV emission. USVs were recorded in three different behavioral paradigms: restraint, free moving in a new environment, and during a social interaction task. We compared USV emission, with or without the presence of a social congener, in animals socially isolated during different periods (0, 6 or 21 days). Social isolation decreased the number of USVs during free moving, whereas it increased during restraint. During the social interaction task, animals produced high-frequency USVs (median: 72.6 kHz, 25–75% range: 67.6–78.2 kHz), especially when the social partner was active and social motivation was high. During restraint, presence of a social congener increased the call rate of low-frequency USVs (median: 52.4 kHz, 25–75% range: 44.8–56.5 kHz). USV frequency followed two unimodal distributions that distinguished low-frequency USVs (≤ 60 kHz) mainly emitted during free-moving (90.9% of total USVs) and restraint (93.1%) conditions, from high-frequency USVs (> 60 kHz) mainly emitted during the social interaction task (85.1% of total USVs). The present study confirms that USV call rate and frequency depend on behavioral states, and provides evidence that the presence of a congener promotes ultrasonic vocalizations in restrained adult mice.
Article Highlights
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Social isolation increased restraint-induced USVs, but decreased USVs induced by free-exploration of a novel environment.
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Social contact increased call rates of high-frequency USVs (> 60 kHz), especially when social partner was active and social motivation was high.
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Restraint induced low-frequency USVs (≤ 60 kHz) in mice, especially when a social congener was in the vicinity.
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Acknowledgements
We thank Ophélie Joly and Lorie Carassini for participating in the animal experiment during internships in the laboratory. This work benefited from the animal platform facility at Neuro-PSI (Orsay, France). The manuscript was corrected by a native English proofreader (Brandon Loveall; contact@improvence.net).
Funding
This research was supported by the Service de Santé des Armées, by the CNRS, Université Paris Sud, and by a grant to FC (PEA 13co709) from the Direction Générale de l’Armement (DGA, France).
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The authors declare that there is no conflict of interest. This research received no specific grant from any funding agency in the commercial sector.
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All applicable international and/or institutional guidelines for the care and use of animals were followed. Experiments were conducted in accordance with the recommendations for animal experiments issued by the European Community Council guidelines (directive 2010/63/EU). The protocol was approved beforehand by an independent ethical board (reference 2015-04).
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Lefebvre, E., Granon, S. & Chauveau, F. Social context increases ultrasonic vocalizations during restraint in adult mice. Anim Cogn 23, 351–359 (2020). https://doi.org/10.1007/s10071-019-01338-2
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DOI: https://doi.org/10.1007/s10071-019-01338-2