Table 5.

Loadings of each audio descriptor on the Principal Components (PC) for each emotion dimension in the PLSR analysis.

	Valence			Tension Arousal				Energy Arousal
	PC1	PC2	PC3	PC1	PC2	PC3	PC4	PC1	PC2	PC3
Spec centroid Med	6.18	-8.53	1.55	10.39	−3.95	1.81	−0.73	9.21	−5.05	0.89
Spec centroid IQR	3.25	−4.45	5.35	2.43	−1.67	−2.07	2.83	3.51	−6.72	3.90
Spec spread IQR	1.46	−2.92	4.27	−0.43	1.38	−2.36	−0.30	0.97	−3.63	5.55
Spec skewness Med	−5.88	8.74	−1.89	−10.29	3.98	−1.07	0.89	−8.91	5.92	−0.64
Spec skewness IQR	0.67	−0.41	4.96	−2.29	0.41	−2.28	3.76	−0.49	−3.50	5.20
Spec decrease Med	−8.10	4.88	−1.12	−8.04	5.88	−3.77	1.60	−10.03	0.86	−0.73
Spec decrease IQR	−4.38	3.96	−1.83	−6.82	4.41	−2.93	−6.32	−6.21	3.24	−1.61
Spec rolloff IQR	1.20	−1.39	4.61	−1.59	0.50	−2.34	2.26	0.30	−3.21	5.87
Spec variation Med	−2.18	−4.58	−6.63	0.99	8.79	4.41	−3.74	−1.40	2.32	2.38
Spec variation IQR	−4.81	−5.62	−3.20	1.68	9.33	−0.30	−2.94	−3.53	−1.65	2.26
Spec flatness Med	−2.10	−6.56	2.56	4.67	0.23	−5.97	−1.65	−0.07	−9.26	−1.43
Spec flatness IQR	1.87	−3.27	3.87	0.92	1.77	−1.54	−2.20	1.87	−1.55	6.58
Spec crest Med	8.20	−0.22	−0.05	3.89	−5.53	4.97	−3.79	8.65	5.09	0.75
Spec crest IQR	6.81	−1.46	1.50	2.38	−3.54	1.85	−5.53	6.87	2.47	1.77
Log attack time	−7.47	−3.19	6.05	4.49	4.06	−7.34	2.65	−4.85	−3.15	6.56
Attack slope	7.99	3.02	−5.67	−4.36	−3.72	7.71	−3.36	5.35	3.93	−5.19
Temporal centroid	−8.38	−1.59	2.56	2.65	3.56	−6.34	4.28	−6.29	−3.41	1.54
Partial R2	0.58	0.06	0.03	0.39	0.09	0.05	0.03	0.72	0.02	0.02

Loadings greater that 8.0 (or the highest value for a given PC if none are above 8) are shown in bold to highlight the primary contributors discussed in the text.