Fixed effects	Estimate	Standard error	95% CI	t	p
Mask condition (unmasked–masked)	0.23	0.02	0.21, 0.26	15.7	< 0.001
Emotion 1 (anger–neutral)	− 0.14	0.04	− 0.21, − 0.06	− 3.7	0.001
Emotion 2 (disgust–neutral)	− 0.37	0.04	− 0.44, − 0.30	− 10.5	< 0.001
Emotion 3 (fear–neutral)	− 0.49	0.04	− 0.57, − 0.41	− 12.2	< 0.001
Emotion 4 (happy–neutral)	− 0.07	0.04	− 0.15, 0.02	− 1.5	0.139
Emotion 5 (sad–neutral)	− 0.33	0.04	− 0.41, − 0.26	− 8.8	< 0.001
Emotion 6 (surprise–neutral)	− 0.13	0.03	− 0.19, − 0.06	− 3.8	< 0.001
Mask condition * emotion 1	0.12	0.02	0.08, 0.16	6.3	< 0.001
Mask condition * emotion 2	0.60	0.02	0.57, 0.64	31.9	< 0.001
Mask condition * emotion 3	0.22	0.02	0.18, 0.25	11.3	< 0.001
Mask condition * emotion 4	0.32	0.02	0.28, 0.36	16.9	< 0.001
Mask condition * emotion 5	0.48	0.02	0.44, 0.51	25.4	< 0.001
Mask condition * emotion 6	0.15	0.02	0.11, 0.19	7.9	< 0.001

Random effects	Variance	SD
Participant (Intercept)	0.01	0.10
Mask condition (unmasked–masked)	< 0.01	0.04
Participant| emotion 1 (anger–neutral)	0.02	0.14
Participant| emotion 2 (disgust–neutral)	0.01	0.10
Participant| emotion 3 (fear–neutral)	0.03	0.18
Participant| emotion 4 (happy–neutral)	0.01	0.09
Participant| emotion 5 (sad–neutral)	0.02	0.13
Participant| emotion 6 (surprise–neutral)	0.01	0.09
Actor (intercept) mask condition	0.01 < 0.01	0.07 0.07
Actor| emotion 1 (anger–neutral)	0.03	0.17
Actor| emotion 2 (disgust–neutral)	0.03	0.16
Actor| emotion 3 (fear–neutral)	0.03	0.18
Actor| emotion 4 (happy–neutral)	0.04	0.20
Actor| emotion 5 (sad–neutral)	0.03	0.17
Actor| emotion 6 (surprise–neutral)	0.02	0.15