Table 2.

Spacings tested. Notes: Performance is measured for each flanker length (1°, 2°, and 4°) and position (radial lower visual field, circumferential lower visual field, radial left visual field, circumferential left visual field). We test seven different target–flanker spacings. For each condition, spacing is calculated in three ways (center spacing, centroid spacing, and edge spacing). Performance is analyzed as a function of each kind of spacing.

Flanker length	Spacing
1°	Center	1.57°	2.02°	2.53°	3.57°	4.60°	5.64°	6.67°
2°		2.07°	2.52°	3.03°	4.07°	5.10°	6.14°	7.17°
4°		3.07°	3.52°	4.03°	5.07°	6.10°	7.14°	8.17°
1°	Centroid	1.49°	1.94°	2.45°	3.49°	4.52°	5.56°	6.59°
2°		1.83°	2.28°	2.79°	3.83°	4.86°	5.90°	6.93°
4°		2.45°	2.90°	3.41°	4.45°	5.48°	6.52°	7.55°
1°	Edge	0.07°	0.52°	1.03°	2.07°	3.10°	4.14°	5.17°
2°		0.07°	0.52°	1.03°	2.07°	3.10°	4.14°	5.17°
4°		0.07°	0.52°	1.03°	2.07°	3.10°	4.14°	5.17°