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The Mouse Inferior Colliculus Responds Preferentially to Non-Ultrasonic Vocalizations.

Mahtab Tehrani1,2, Sharad Shanbhag3,2, Julia J Huyck2,4

  • 1Department of Anatomy and Neurobiology and Hearing Research Group, Northeast Ohio Medical University, Rootstown, Ohio 44272 jjw@neomed.edu mtehrani@neomed.edu.

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Summary

The inferior colliculus processes social vocalizations, but ultrasonic vocalizations (USVs) are surprisingly underrepresented compared to lower-frequency sounds, despite their abundance in mice.

Keywords:
acoustic communicationestrousfrequency tuningsexsubdivision

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Animal Behavior

Background:

  • The inferior colliculus (IC) is a key midbrain center for auditory processing, integrating social vocalizations for higher-level analysis.
  • Understanding how the IC represents different vocalizations is crucial for deciphering auditory communication.

Purpose of the Study:

  • To characterize and map neural responses to social vocalizations within the mouse IC.
  • To compare the representation of ultrasonic vocalizations (USVs) with other vocalizations across IC subdivisions and sexes.

Main Methods:

  • Multichannel recordings were used in anesthetized and unanesthetized female and male mice.
  • Responses to social vocalizations and synthetic stimuli were analyzed in relation to frequency tuning, IC subdivisions, and sex.
  • Neural tuning to USV frequencies was assessed.

Main Results:

  • Lower-frequency social vocalizations evoked widespread responses across the IC, tonotopic axis, subdivisions, and sexes.
  • Responses to USVs were significantly more limited, with few units tuned to high USV frequencies.
  • Vocal response representations were largely consistent between sexes and IC subdivisions.

Conclusions:

  • A paradox exists where abundant USVs are less represented than lower-frequency vocalizations in the IC.
  • Limited neural tuning to high USV frequencies underlies their reduced representation.
  • USVs with lower frequency components may be linked to emotional intensity and engage more auditory neurons.