Table 1.

Order of testing conditions for each subject.

Subject	1st orientation tested	2nd orientation tested	Spatial resolution sequence
S1	V	H	Increasing
S2	H	V	Decreasing
S3	H	V	Increasing
S4	V	H	Decreasing

Subjects started either with a horizontal (S2, S3) or vertical (S1, S4) viewing window orientation. Within each orientation, the order in which spatial resolutions were presented was either increasing (2.6–9 pixels/char) or decreasing (9–2.6 pixels/char).