Table 1. Affective and acoustic features of voluntary and spontaneous laughs.
| Spontaneous Laughter |
Voluntary Laughter |
|||||
|---|---|---|---|---|---|---|
| Feature | M | SD | M | SD | t(34) | p |
| Authenticity (1-7) | 4.67 | 0.81 | 3.62 | 0.92 | 3.65 | .001 |
| Arousal (1-7) | 4.97 | 0.64 | 4.52 | 0.75 | 1.94 | .061 |
| Valence (1-7) | 5.58 | 0.60 | 5.23 | 0.47 | 1.96 | .058 |
| Total duration (sec) | 2.44 | 0.26 | 2.36 | 0.36 | 0.71 | .481 |
| F0 mean (Hz) | 451.70 | 91.17 | 272.08 | 64.91 | 6.81 | < .001 |
| F0 variability (Hz) | 144.48 | 45.42 | 108.20 | 54.53 | 2.17 | .037 |
| F0 minimum (Hz) | 225.69 | 95.87 | 137.84 | 50.03 | 3.45 | .002 |
| F0 maximum (Hz) | 815.41 | 115.37 | 546.36 | 195.48 | 5.03 | < .001 |
| F0 range (Hz) | 589.72 | 155.38 | 408.52 | 194.82 | 3.09 | .004 |
| Spectral centre of gravity (Hz) | 858.93 | 219.76 | 767.22 | 296.06 | 1.15 | .258 |
| Intensity variability (dB) | 13.91 | 2.06 | 14.02 | 2.31 | .026 | .884 |
| HNR (dB) | 6.10 | 2.20 | 6.80 | 3.42 | 1.47 | .469 |
Note. F0 = Fundamental Frequency. t values correspond to the statistic of independent samples t-tests (two-tailed). Significant differences are highlighted in bold. On a scale from 1 to 7, higher values indicate higher authenticity, higher arousal, and more positive valence.