Table 4.

χ² analysis of the responses of PB and normals when asked to identify the color of one of the test patches when illuminated in a variety of ways

Response given was	As if target was seen in void condition	As if target was in natural condition	Same for void and natural viewing	Incorrect for void and natural viewing	Total responses
PB	21	4	12	15	52
Normal	6	33	13	0	52

Six of the presentations were made in the void condition only; in thirteen of the presentations, the target had the same color when viewed in the natural and the void conditions. Difference is significant at P < 0.0001.