approached significancep = 0.092
The main effect of background color also approached significance F (1, 14) = 3.27, p = 0.092, partial η 2 = 0.190) with pairwise comparisons showing larger curvature for grey (mean = 0.272) than red (mean = 0.237) background (mean difference = 0.035, CI. 95 : 0.007, 0.077).