Peripheral hyperacuity: three-dot bisection scales to a single factor from 0 to 10 degrees.

Performance of three-dot bisection was determined as a function of the feature separation at eccentricities of 0-10 deg along the inferior vertical field meridian by using dot stimuli scaled in size to compensate for eccentricity. For these briefly flashed dot stimuli, the entire function of three-dot bisection acuity against dot separation worsens away from the fovea with a single scaling factor that is compatible with the change of the cortical magnification factor in area V1. When the presentation duration of the stimulus was lengthened from 150 msec to 1 sec, the improvement was much greater in the fovea than at 10-deg eccentricity for closely separated stimuli. We attribute this difference to a luminance cue (detection of a brightness change) that is present for a long stimulus duration at small separations in the fovea, but not in the periphery.

[1]  Dennis M. Levi,et al.  Spatial localization in normal and amblyopic vision , 1983, Vision Research.

[2]  O. Braddick.  Visual hyperacuity. , 1984, Nature.

[3]  S P McKee,et al.  Interference with line-orientation sensitivity. , 1976, Journal of the Optical Society of America.

[4]  Allan W. Snyder.  Hyperacuity and interpolation by the visual pathways , 1982, Vision Research.

[5]  C. A. Burbeck,et al.  Exposure-duration effects in localization judgments. , 1986, Journal of the Optical Society of America. A, Optics and image science.

[6]  S. Klein,et al.  Hyperacuity thresholds of 1 sec: theoretical predictions and empirical validation. , 1985, Journal of the Optical Society of America. A, Optics and image science.

[7]  R. Nussenblatt,et al.  Effects of cyclosporine on T-cell subsets in experimental autoimmune uveitis. , 1985, Investigative ophthalmology & visual science.

[8]  A. Watson.  Probability summation over time , 1979, Vision Research.

[9]  S. McKee,et al.  Visual acuity in the presence of retinal-image motion. , 1975, Journal of the Optical Society of America.

[10]  S. Klein,et al.  Positional uncertainty in peripheral and amblyopic vision , 1987, Vision Research.

[11]  R. Shapley,et al.  Hyperacuity in cat retinal ganglion cells. , 1986, Science.

[12]  Hugh R. Wilson,et al.  Eccentricity dependence of contrast matching and oblique masking , 1985, Vision Research.

[13]  G. Westheimer.  The spatial grain of the perifoveal visual field , 1982, Vision Research.

[14]  N. Drasdo.  The neural representation of visual space , 1977, Nature.

[15]  G. Westheimer.  Scaling of visual acuity measurements. , 1979, Archives of ophthalmology.

[16]  John H. R. Maunsell,et al.  The visual field representation in striate cortex of the macaque monkey: Asymmetries, anisotropies, and individual variability , 1984, Vision Research.

[17]  E. Switkes,et al.  Deoxyglucose analysis of retinotopic organization in primate striate cortex. , 1982, Science.

[18]  J. Rovamo,et al.  Cortical magnification factor predicts the photopic contrast sensitivity of peripheral vision , 1978, Nature.

[19]  W. Charman,et al.  Off-axis image quality in the human eye , 1981, Vision Research.

[20]  Gerald Westheimer,et al.  Temporal and spatial interference with vernier acuity , 1975, Vision Research.

[21]  F. W. Weymouth.  Visual sensory units and the minimal angle of resolution. , 1958, American journal of ophthalmology.

[22]  S. Klein,et al.  Vernier acuity, crowding and cortical magnification , 1985, Vision Research.

[23]  S. Klein,et al.  Detection and discrimination of the direction of motion in central and peripheral vision of normal and amblyopic observers , 1984, Vision Research.

[24]  Ingo Rentschler,et al.  Loss of spatial phase relationships in extrafoveal vision , 1985, Nature.