Abstract
The area of spatial summation between pairs of briefly flashed lines increases only modestly (by a factor of 1.6) between foveal vision and parafoveal vision at an eccentricity of 7 deg, in contrast to two-line acuity, which changes by a factor of as much as 7. This dissociation suggests that different mechanisms underly the two functions. These results may be explained by a parallel, two-mechanism model or by spatial undersampling in the parafovea.
© 1989 Optical Society of America
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