Table 5.

The CEs and JNDs for each illusion (in percentages), Experiment 2. The CE represents the magnitude of the illusion. The JND represents visual resolution for difference in size.

Illusion	Session	N	Measure	Mean	SD	Skewness	Kurtosis
Ponzo	1	66	CE	46.16	23.31	0.54	0.41
			JND	12.70	6.79	0.74	0.28
	2	63	CE	47.37	23.55	0.55	0.50
			JND	9.10	5.13	1.23	1.39
Ebbinghaus	1	68	CE	40.87	3.39	0.42	−0.21
			JND	7.49	4.07	2.46	9.88
	2	65	CE	40.19	2.91	0.18	−0.54
			JND	6.01	2.99	0.77	0.47
Height–width	1	66	CE	4.31	3.48	6.34e-03	−0.04
			JND	4.30	2.04	1.28	1.06
	2	68	CE	4.18	3.57	−0.54	0.82
			JND	3.25	1.42	0.34	1.41