Table 1.

For each sex skin region, measures of the maximum JND variation that males showed from their own (intraindividual) and the all male (interindividual) maximum lightness images. Values presented represent the mean (with SEM) maximum variation (i.e., the average maximum JND score showed across all males), as well as the min and max JND scores showed by any male. Note that each image in the dataset was compared to the image of maximum lightness (of that male for intraindividual analyses and of all males for interindividual analyses). However, this scaling image may not necessarily be the least colorful image. As such, though luminance measures must necessarily always be higher for interindividual measures when compared to intraindividual measures, this is not the case for color measures

		Face	Rump	Genitals
Intraindividual color variation (JNDs)	x̄	1.5	1.7	2.4
	SEM	0.1	0.2	0.4
	Min	0.5	0.8	0.7
	Max	2.3	3.2	7.2
Intraindividual luminance variation (JNDs)	x̄	17.5	19.3	27.1
	SEM	1.4	1.6	2.4
	Min	10.1	9.9	14.3
	Max	34.2	36.5	50.9
Interindividual color variation (JNDs)	x̄	1.9	2.4	2.1
	SEM	0.1	0.1	0.4
	Min	1.4	1.4	0.6
	Max	2.5	3.1	6.6
Interindividual luminance variation (JNDs)	x̄	28.2	28.2	39.2
	SEM	1.5	1.4	2.1
	Min	18.8	18.9	25.4
	Max	40.4	46.4	67.8