Table S3.
The means and SDs of the perceptual naturalness ratings for the manipulated stimuli
| Stimuli | Frequency spectrum manipulation | Intensity manipulation | Rate manipulation | |||
| High | Low | Loud | Soft | Fast | Slow | |
| Human | 3.90 (0.51) | 3.93 (0.62) | 3.96 (0.70) | 3.83 (0.81) | 3.99 (0.36) | 4.12 (0.78) |
| Animal | 3.60 (0.46) | 3.78 (0.88) | 4.12 (1.11) | 3.78 (0.74) | 3.82 (0.78) | 4.02 (0.85) |
| Machine | 3.70 (0.61) | 3.84 (0.60) | 3.90 (0.80) | 4.05 (0.84) | 3.62 (0.42) | 4.01 (0.79) |
| Nature | 4.88 (0.95) | 5.20 (0.84) | 5.39 (1.55) | 4.72 (0.90) | 5.27 (0.55) | 5.04 (1.00) |
Note: The ratings for rate manipulations were the average ratings across long and short versions. The naturalness ratings did not differ between the increased and decreased stimuli in any types of manipulation.