Fixed effects	Estimate	Standard error	95% CI	t	p
Mask condition (unmasked–masked)	0.23	0.02	0.20, 0.26	14.5	< 0.001
Stimuli ethnicity (White–non-White)	0.02	0.03	− 0.03, 0.07	0.8	0.431
Participant ethnicity (White–non-White)	0.01	0.02	− 0.04, 0.06	0.4	0.724
Mask * stimuli ethnicity	− 0.02	0.03	− 0.08, 0.04	− 0.6	0.573
Mask * participant ethnicity	−  < 0.1	0.02	− 0.03, 0.03	< 0.1	0.964
Stimuli ethnicity * participant ethnicity	− 0.01	0.01	− 0.03, 0.02	− 0.3	0.755
Mask * stimuli ethnicity * participant ethnicity	− 0.02	0.03	− 0.08, 0.03	− 0.8	0.396

Random effects	Variance	SD
Participant (Intercept)	0.01	0.11
Participant| mask condition	< 0.01	0.04
Participant| stimuli ethnicity	< 0.01	< 0.01
Participant| participant ethnicity	< 0.01	0.02
Actor (Intercept)	< 0.01	0.04
Actor| mask condition	< 0.01	0.06
Actor| stimuli ethnicity	0.01	0.10
Actor| participant ethnicity	< 0.01	< 0.01