Table 1.

Factorial ANOVA showing the main effects and interactions between group, time, foreground, and surround contrasts

	F statistic	p value
Group × time × foreground × surround contrast	F8,13 = 2.706	p = 0.008
Group	F1,20 = 3.738	p = 0.0674
Foreground	F4,17 = 16.496	p = 6.7911 × 10–10
Foreground × group	F4,17 = 0.606	p = 0.659
Surround contrast	F2,19 = 1.660	p = 0.203
Surround contrast × group	F2,19 = 4.033	p = 0.025
Time	F1,20 = 21.595	p = 0.000155
Time × group	F1,20 = 5.881	p = 0.025
Foreground × surround contrast	F8,13 = 7.942	p = 5.5932 × 10−9
Foreground × surround contrast × group	F8,13 = 1.438	p = 0.185
Foreground × time	F4,17 = 31.424	p = 1.0006 × 10−15
Foreground × time × group	F4,17 = 4.783	p = 0.002
Surround contrast × time	F2,19 = 10.439	p = 0.000225
Surround contrast × time × group	F2,19 = 1.851	p = 0.170
Foreground × surround contrast × time	F8,13 = 9.421	p = 1.2695 × 10−10