Table 4.

Definitions of vocalization characteristics recorded during the Social Challenge Test (adapted from Chapel et al. 2018)

Variable	Description
Duration, s	Duration of each individual call
Peak frequency, Hz	Loudest frequency found within a call
Bandwidth, Hz	The difference between the minimum and maximum frequency
Entropy	The randomness within a call where zero is a pure-tone and one is completely random noise
Total duration, s	Total time of all calls together
Interval between calls, s	Time between calls
Harmonic to noise ratio	Ratio of the degree of harmonic sound to additional noise produced within a call