Table S2.

The means and SDs of the perceptual discriminability ratings for the manipulated stimuli and the paired-sample t tests between experimental trials (manipulated stimuli) and controls

Stimuli and controls	Frequency spectrum manipulation		Intensity manipulation		Rate manipulation
	Mean (SD)	t Tests against controls	Mean (SD)	t Tests against controls	Mean (SD)	t Tests against controls
Human	1.62 (0.32)	t = 16.83	1.59 (0.36)	t = 16.87	1.62 (0.32)	t = 16.83
Animal	1.85 (0.22)	t = 29.98	1.32 (0.36)	t = 13.16	1.85 (0.22)	t = 29.98
Machine	1.72 (0.30)	t = 25.30	1.59 (0.36)	t = 16.81	1.72 (0.30)	t = 25.30
Nature	1.30 (0.44)	t = 11.10	1.42 (0.43)	t = 13.46	1.30 (0.44)	t = 11.10
Control	0.17 (±0.15)

Note: The rating for the control was the average rating across all manipulation-types. The ratings for rate manipulations were the average ratings across long and short versions. All Ps < 0.001.