Anikin, A., Pisanski, K., & Reby, D. (2020). Do nonlinear vocal phenomena signal negative valence or high emotion intensity? Royal Society Open Science 7: 201306.

Download supplements (audio stimuli, data from experiments, scripts for analysis, and html for running the experiments; ~18 MB)

Examples of vocalizations for each call type and manipulation

Call type No nonlinearities Subharmonics and/or sidebands Deterministic chaos
Gasp
Moan
Roar
Scream