Table 1.

The stimulus parameters used to test PB’s form vision

Color	CIE 1931 co-ords (x, y, Y CD⋅m−2)
Red	0.600, 0.347, 3.75
Green	0.313, 0.584, 3.71
Blue	0.155, 0.069, 3.99
Yellow	0.422, 0.489, 4.53
Cyan	0.227, 0.294, 4.17
Magenta	0.299, 0.160, 3.89
White	0.302, 0.315, 27.5
Light gray	0.301, 0.314, 22.6
Mid gray	0.302, 0.312, 17.5
Dark gray	0.302, 0.309, 10.1
Black	0.305, 0.298, 3.51
Form	Width
Boat	14 × 17
Car	18 × 8
Chair	10 × 20
Cross	14 × 19
House	20 × 17
Key	19 × 9
Tree	23 × 21