Table 4.

Contribution of Group (A) and Proficiency (B) Alone on N400 Onset Latencies

Coefficient	df	SumSq	MeanSq	F	p (Lower Bound)	p (Upper Bound)
A. Group Alone (Denominator Lower bound df = 1876; Upper Bound df = 2280)
ROI	8	3012.3	376.5	0.5	.82	.82
Group	1	1598.5	1598.5	2.3	.13	.13
ROI × Group	8	3888.8	486.1	0.7	.69	.69
B. Proficiency Alone (Denominator Lower Bound df = 1875; Upper Bound df = 2279)
ROI	8	2538.0	317.3	0.5	.88	.88
Proficiency	1	164.1	164.1	0.2	.62	.62
ROI × Proficiency	8	2842.5	355.3	0.5	.84	.84

Note that proficiency was mean-centered but not residualized. 3.6% of the data were trimmed.