Acoustic features of control rumbles and 6 vocalization playback stimuli, and behavioral responses to playbacks.

aNon-linear phenomena (NLP; See Materials and Methods) is a dichotomous variable (YES = present; NO = absent).bVIG: Average rate of vigilance behavior (per min) in response to vocal playback stimulus.cDIS: Average distance moved (m) in response to vocal playback stimulus.dValues in bold are greater than +1 SEM of the pre-stimulus control rumble values.eFor further details on these playback stimuli, see [23].