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Understanding pup affective state through ethologically significant ultrasonic vocalization frequency.

Julie Boulanger-Bertolus1,2, Millie Rincón-Cortés3, Regina M Sullivan3

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Rats emit ultrasonic vocalizations (USV) differently across ages when facing stress. Infant rats produce two distinct USV types, unlike juveniles and adults who emit one, revealing age-specific communication signals.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Developmental Biology

Background:

  • Rats emit ultrasonic vocalizations (USV) in response to aversive stimuli.
  • Previous studies used age-specific methods to elicit USV, hindering developmental comparisons.

Purpose of the Study:

  • To characterize ultrasonic vocalizations (USV) in rats across different developmental stages (infancy, juvenile, adulthood) using a consistent aversive stimulus.
  • To investigate the characteristics and context-specific emission of infant USV.

Main Methods:

  • Rats of different ages (infant, juvenile, adult) were exposed to mild foot-shocks.
  • Ultrasonic vocalizations (USV) were analyzed for frequency, duration, and relation to respiration and behavior.
  • Infant rats were also observed during rough maternal interactions to assess naturalistic USV emission.

Main Results:

  • Juvenile and adult rats emitted a single class of USV with age-dependent frequency and duration.
  • Infant rats emitted two distinct classes of USV (40 kHz and 66 kHz) with unique respiratory and behavioral correlations.
  • Rough maternal treatment increased 40-kHz USV in infants but did not affect 66-kHz USV.

Conclusions:

  • Rat ultrasonic vocalizations (USV) exhibit significant developmental changes in type and acoustic properties.
  • Infant rats possess a more complex USV repertoire, suggesting nuanced communication related to affective state.
  • USV analysis across development provides insights into age-specific distress signaling and emotional states in rats.