Long-term and persistent vocal plasticity in adult bats

Area of Science:

• Bioacoustics
• Animal Behavior
• Neuroscience of Vocal Learning

Background:

• Bats possess complex vocal communication systems, with some calls learned during development.
• Vocal plasticity, the ability to modify vocalizations, is crucial for learned vocalizations and is rare in non-human animals.
• Bats' long lifespans and complex social structures suggest potential for vocal plasticity in adulthood.

Purpose of the Study:

• To investigate vocal plasticity in adult bats (Rousettus aegyptiacus).
• To determine if adult bats can modify vocalizations in response to acoustic perturbation.
• To assess the persistence of these vocal modifications after the perturbation ceases.

Main Methods:

• Adult Egyptian fruit bats (Rousettus aegyptiacus) were exposed to broad-band acoustic perturbation.
• Vocalizations were recorded and analyzed for changes in distinct acoustic parameters.
• Vocal changes were monitored for persistence after the cessation of acoustic exposure.

Main Results:

• Adult bats successfully modified specific parameters of their vocalizations following acoustic perturbation.
• These vocal modifications persisted for several weeks to months after the noise exposure ended.
• Demonstrates significant and lasting vocal plasticity in adult bats.

Conclusions:

• Adult bats exhibit substantial and persistent vocal plasticity.
• These findings establish bats as a valuable model organism for studying vocal plasticity, particularly in adulthood.
• Supports the hypothesis that bats retain high vocal adaptability throughout their lives.