Table 2. At what eccentricity positive BOLD turns to negative BOLD.

			Center stimulus Peripheral direction,from 2.3°	Near Surround stimulus		Far Surround stimulusCentral direction,from 8.7°
				Central direction,from 2.3°	Peripheral direction,from 4.0°
V1		Average (95% CI) Degrees	7.7°(3.8° – >12°)	<1°(2.3° – <1°)	9.5°(7.1° – 11.5°)	<1°(<1° – <1°)
		Average spread (95% CI) Millimeters	12.4 mm(2.3 mm –>19.2 mm)	>12.6 mm(5.6 mm –>12.6 mm)	8.5 mm(4.1 mm –11.4 mm)	>28.7 mm(>28.7 mm – >28.7 mm)
V2		Average (95% CI) Degrees	8.2°(4.6° – >12°)	<1°(3.2° – <1°)	9.7°(8.1° – 11.1°)	<1°(1.6° – <1°)
V3		Average (95% CI) Degrees	10.1°(4.7° – >12°)	<1°(<1° – <1°)	10.4°(9.5° – 11.2°)	<1°(<1° – <1°)

Spatial spread of positive BOLD signal for center, near surround, and far surround in V1, V2 and V3. The angles indicate the average (95% CI) eccentricity representation where the positive BOLD signal turns to negative BOLD signal. For central direction, the value at the title row indicates the inner edge eccentricity of the stimulus ring. For peripheral direction, the value indicates the outer edge, correspondingly.