Table 4.

Proportion correct and standard deviations for 4- to 6-year-olds in the perception of the symmetry axis task in Experiment 2

Age	n	2.5°	5°	10°	15°	20°
4 years old	20	0.47(0.38)	0.53(0.41)	0.75(0.35)	0.86(0.29)	0.81(0.33)
5 years old	25	0.68(0.40)	0.68(0.36)	0.85(0.24)	0.93(0.20)	0.95(0.16)
6 years old	21	0.69(0.31)	0.71(0.38)	0.93(0.14)	0.98(0.11)	0.97(0.13)
Total	66	0.56(0.38)	0.64(0.39)	0.85(0.27)	0.93(0.22)	0.91(0.23)