TABLE 5.

Adjusted R² Values and Standardized Regression Coefficients β_i for the IAPS, GAPED, NAPS-H and NAPS-SFIP datasets.

Variable/Parameter	IAPS (n = 1182)			GAPED (all) (n = 728)		NAPS-H (n = 1356)			NAPS-SFIP (n = 886)
	Valence	Arousal	Dominance	Valence	Arousal	Valence	Arousal	AV-AP	Valence	Arousal	Fear
Adjusted R2	0.060***	0.087***	0.020*	0.190***	0.185***	0.141***	0.132***	0.146***	0.102***	0.076***	0.051***
AIC	1287.7	232.3	174.4	4556.5	4184.2	1125.3	−28.5	853.0	−235.6	−1296.1	−3664.8
H-channel				0.117	−0.092	0.172	−0.160	0.174	0.139	−0.049	−0.079
S-channel	0.134	0.044		0.179	−0.084	0.253	−0.21	0.234	0.132		−0.054
V-channel	0.102	0.046	−0.048	0.132	−0.165					0.071
Symmetry left/right	0.060	−0.116	−0.065	0.095	−0.072	0.164	−0.145	0.154	196	−0.105
Symmetry up/down	−0.145	−0.097		−0.182	0.079	−0.146	0.148	−0.191	−0.145	−0.203
Edge density		0.097				0.155	−0.078	0.159	0.127	−0.226	−0.193
Self-similarity	0.076		−0.065	0.074			−0.072			0.111
Fourier slope	0.137	−0.153		0.101	−0.159		−0.052		0.062		−0.055
Fourier sigma	−0.098	0.048		−0.159	0.132				−0.092
1st-order entropy	−0.095	0.105	0.090		0.088		0.137	−0.04		0.214	0.105
2nd-order entropy		0.127	−0.16	0.062					−0.065	0.133
Variance Pa	0.112		0.14	0.171	−0.13	0.183	−0.154	0.191	0.142	−0.088	−0.119
Variance Pf		−0.141		0.128	−0.224			−0.062		−0.167

Results are for models, in which the number of variables was reduced according to the Akaike Information Criterion (see section “Materials and Methods”). Bolded variables had a significant effect on the ratings when the other variables were controlled for. AIC, Akaike Information Criterion (compare to Supplementary Table S2). Significant at level ^∗p < 0.05; ^∗∗p < 0.01; ^∗∗∗p < 0.001.