Table 1.

Unstandardized predictors of a linear mixed model (LMM) for pupil dilation for five time intervals after letter onset.

Predictors	0.5 s	0.75 s	1 s	1.25 s	1.5 s
Intercept	0.041	0.013	0.010	0.002	−0.034
Brightness	0.113	0.337	0.467	0.546	0.628
Key press	0.012	0.062	0.150	0.239	0.219
Saccade direction	0.58	0.136	0.166	0.183	0.200
Choice	0.019	0.070	0.092	0.093	0.086
Tone	0.005	0.039	0.044	0.057	0.032
Key press*choice	−0.011	−0.022	−0.039	−0.035	−0.055
Brightness*choice	−0.004	−0.041	−0.083	−0.118	−0.042
Brightness*direction	−0.031	−0.052	−0.062	−0.059	−0.033
R2	0.314	0.503	0.574	0.604	0.622

Bold numbers indicate statistical significance of predictors to α = 0.05 level (Bonferroni corrected). Only downwards saccades differed from all other directions for the factor saccade direction.