Table 3.

Vocalization Feature Definitions

Vocalization Feature	Definition
Volubility	Number of speech syllables / length of audio clip in minutesa
Complexity	Complexity Ratio: Number of canonical syllables / Total number of syllablesb Complexity Status: Absence/presence of canonical syllables
Average Duration	Average length in seconds of all speech syllables
Duration Range	Difference between shortest and longest speech vocalization duration
Average Pitchc	Average pitch in Hertz of all speech syllables
Pitch Rangec	Difference between minimum and maximum speech vocalization pitch

Note.

^aOller et al., 1994

^bBelardi et al., 2017; Patten et al., 2014

^cOnly Codability = No-Overlap vocalizations were used in calculating pitch variables.