Temporal vocal features suggest different call-pattern generating mechanisms in mice and bats.

Area of Science:

• Bioacoustics
• Mammalian Vocalization
• Comparative Physiology

Background:

• Mice exhibit high-rate ultrasonic vocalizations (USVs) with unknown generation mechanisms.
• Possible mechanisms include respiratory cycle integration (bats) or distinct vocal systems (primates).
• Understanding mouse USV production is crucial given their use in disease modeling.

Purpose of the Study:

• Investigate the temporal call patterns of mice and bats.
• Differentiate between respiratory-coupled and independent vocal production in mice.
• Compare USV production mechanisms in mice and bats.

Main Methods:

• Analyzed temporal characteristics of mouse and bat ultrasonic calls.
• Measured call durations, call intervals, and inter-call intervals.
• Compared call patterns between mice and horseshoe bats.

Main Results:

• Bat echolocation calls showed respiratory cycle correlation (duration independent of intervals, negatively correlated with inter-call interval).
• Mouse USVs demonstrated a direct correlation between call intervals and call duration.
• Mouse vocal production showed minimal correlation between call duration and inter-call intervals, suggesting respiratory independence.

Conclusions:

• Mouse ultrasonic vocalizations utilize call-pattern generating mechanisms distinct from bats.
• Mouse vocal production appears analogous to primate vocal systems.
• Findings offer insights into mouse vocalizations, relevant for neurodevelopmental and neurodegenerative disease research.