Table 2.

Within-group contrasts for video-based mood induction based on self-reported valence and arousal.

Muscle	Mood contrast	t-test	Effect size (r)
Valence
Left brow	Positive – Neutral	2.25*	0.07
	Positive – Negative	3.94***	0.19
	Negative – Neutral	6.71***	0.39
Right brow	Positive – Neutral	2.33*	0.07
	Positive – Negative	4.08***	0.20
	Negative – Neutral	6.59***	0.38
Left cheek	Positive – Neutral	12.75***	0.69
	Positive – Negative	6.63***	0.39
	Negative – Neutral	5.60***	0.30
Right cheek	Positive – Neutral	13.41***	0.71
	Positive – Negative	6.21***	0.36
	Negative – Neutral	6.13***	0.35
Arousal
Left brow	High – Medium	7.20***	0.42
	High – Low	9.81***	0.59
	Low – Medium	4.96***	0.26
Right brow	High – Medium	7.82***	0.46
	High – Low	10.32***	0.61
	Low – Medium	4.67***	0.23
Left cheek	High – Medium	8.65***	0.51
	High – Low	9.93***	0.59
	Low – Medium	5.79***	0.32
Right cheek	High – Medium	10.40***	0.60
	High – Low	11.38***	0.66
	Low – Medium	6.11***	0.35

*p < 0.05 and ***p < 0.001.