Blast trauma affects production and perception of mouse ultrasonic vocalizations.

Blast trauma from explosions affects hearing and communication in a significant proportion of soldiers. Many veterans report difficulty communicating, especially in noisy and reverberant environments, which contributes to complex mental health problems including anxiety and depression. However, the relationship between communication and perceptual problems after a blast has received little scientific attention. In the current studies, the effects of blast trauma on the production and perception of ultrasonic vocalizations (USVs) by CBA/CaJ mice, a common animal model for hearing and communication disorders, was explored. Overall, mice change the total number of vocalizations, the proportion produced of each syllable category, and the peak frequency, bandwidth, and duration of their vocalizations after blast exposure. Further, the perception of USVs is affected after blast trauma, with an immediate worsening of detection for most USV categories in the first 1-5 days after blasts, which later recovers. This study is the first to examine changes in the production and perception of communication signals after blast traumas in mice and is an important step towards developing treatments for blast-induced hearing and communication disorders.