Table 4. Acoustic features of control rumbles and 6 vocalization playback stimuli, and behavioral responses to playbacks.
| Acoustic feature | Behavior | ||||||
| F 0 (Hz) | F 0 range (Hz) | F1 (Hz) | F2 (Hz) | NLPa | VIGb | DISc | |
| Pre-stimulus control rumbles (Mean +1 SEM) | 15.9 | 3.0 | 34.7 | 115.6 | NO | ||
| Vocal playback stimuli | |||||||
| Samburu multi-call mean | 23.1 d | 8.4 | 44.8 | 153.1 | YES | 5.0 | 50.5 |
| Samburu rumble mean | 21.2 | 5.2 | 51.9 | 145.3 | NO | 3.2 | 20.0 |
| Samburu modified rumble mean | 21.1 | 5.3 | 40.8 | 100.9 | NO | 2.6 | 11.0 |
| Bee rumble meane | 16.2 | 2.4 | 28.8 | 132.1 | NO | 3.1 | 23.6 |
| Bee modified rumble meane | 16.0 | 2.5 | 29.4 | 104.2 | NO | 0.8 | 9.9 |
| Control rumble meane | 14.9 | 6.4 | 31.9 | 114.5 | NO | 0.4 | 0.4 |
a
Non-linear phenomena (NLP; See Materials and Methods) is a dichotomous variable (YES = present; NO = absent).
b
VIG: Average rate of vigilance behavior (per min) in response to vocal playback stimulus.
c
DIS: Average distance moved (m) in response to vocal playback stimulus.
d
Values in bold are greater than +1 SEM of the pre-stimulus control rumble values.
e
For further details on these playback stimuli, see [23].