Table 1. Rho, p-values, and confidence intervals of Spearman correlations between illusions (behavioral results).

	Ponzo	Vertical-horizontal	Muller-Lyer	Ebbinghaus	Contrast
Ponzo	Rho = 1
Vertical-horizontal	Rho = 0.05, p = 0.69, CI [−0.32:0.43]	Rho = 1
Muller-Lyer	Rho = 0.13, p = 0.35, CI [−0.26:0.49]	Rho = 0.16, p = 0.24, CI [−0.23:0.51]	Rho = 1
Ebbinghaus	Rho = 0.25, p = 0.06, CI [−0.15:0.58]	Rho = 0.11, p = 0.44, CI [−0.31:0.48]	Rho = 0.45, p < 0.001, CI [0.11:0.71]	Rho = 1
Contrast	Rho = 0.10, p = 0.43, CI [−0.26:0.43]	Rho = −0.02, p = 0.88, CI [−0.40:0.36]	Rho = −0.03, p = 0.86, CI [−0.42:0.38]	Rho = 0.07, p = 0.58, CI [−0.28:0.41]	Rho = 1

Confidence intervals (CI) and p-values were calculated using bootstrap analysis. Confidence intervals are 99.5%, to accommodate multiple comparison correction for 10 comparisons. Note the highly significant correlation p-value between the Ebbinghaus and Muller-Lyer illusions (marked with bold).