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Recording Mouse Ultrasonic Vocalizations to Evaluate Social Communication
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High-precision spatial localization of mouse vocalizations during social interaction.

Jesse J Heckman1, Rémi Proville1, Gert J Heckman2

  • 1Department of Neurophysiology, Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, The Netherlands.

Scientific Reports
|June 9, 2017
PubMed
Summary

Researchers developed new algorithms to precisely track mouse ultrasonic vocalizations (USVs) during social interactions. This improves understanding of complex mouse communication and sex differences in vocal patterns.

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Area of Science:

  • Bioacoustics
  • Animal Behavior
  • Neuroscience

Background:

  • Mice exhibit diverse vocalizations, particularly complex ultrasonic vocalizations (USVs) during courtship, with limited understanding of their structure and individual attribution.
  • Current USV localization methods offer centimeter resolution, insufficient for close-range social interactions involving tactile exploration.
  • Accurate USV source attribution is crucial for studying social vocal communication in mice.

Purpose of the Study:

  • To develop and validate improved algorithms for precise spatial localization and individual attribution of mouse USVs.
  • To enhance the understanding of social vocalizations by enabling reliable assignment of USVs to specific individuals during interaction.

Main Methods:

  • Development of multiple USV localization algorithms, including an analytical solution for varied microphone setups.
  • Comparison of algorithms using acoustic noise and single mouse vocalizations, followed by application to optically tracked social interactions.
  • Implementation of a novel frequency envelope-weighted generalized cross-correlation method.

Main Results:

  • The novel algorithm achieved median localization errors of approximately 1.4 mm for noise and 4-8.5 mm for mouse vocalizations.
  • Improved USV assignment to individuals was achieved by combining the new algorithm with a level criterion.
  • Significant differences in mean USV properties were observed between male and female CBA mice during social interactions.

Conclusions:

  • The developed USV localization and attribution methods significantly enhance the precision of tracking mouse vocalizations during social behavior.
  • This improved attribution provides a foundation for deeper investigation into the complexities of mouse social vocalizations and their sequential patterns.
  • Findings highlight sex-specific differences in mouse USV characteristics during social interaction.