December 2002
Volume 2, Issue 10
Free
OSA Fall Vision Meeting Abstract  |   December 2002
Visual acuity correlates with cortical magnification factors in human V1
Author Affiliations
  • Geoffrey M. Boynton
    SNL-B, The Salk Institute, La Jolla, CA, USA
  • Robert O. Duncan
    SNL-B, The Salk Institute, La Jolla, CA, USA
Journal of Vision December 2002, Vol.2, 11. doi:10.1167/2.10.11
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      Geoffrey M. Boynton, Robert O. Duncan; Visual acuity correlates with cortical magnification factors in human V1. Journal of Vision 2002;2(10):11. doi: 10.1167/2.10.11.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

We show that visual acuity in humans is limited by the amount of primary visual cortex (V1) devoted to a region of the visual field, called the linear cortical magnification factor (M). We used fMRI to measure M in V1, and two psychophysical tasks to measure acuity (Vernier and grating) in the same ten observers. Across observers, the decrease in M with increasing eccentricity predicts the corresponding decrease in acuity for both tasks. Furthermore, observers with lower grating acuity thresholds, measured with laser interferometry, had a significantly greater overall M. These results establish faithful estimates of cortical limits to visual acuity.

Boynton, G. M., Duncan, R. O.(2002). Visual acuity correlates with cortical magnification factors in human V1 [Abstract]. Journal of Vision, 2( 10): 11, 11a, http://journalofvision.org/2/10/11/, doi:10.1167/2.10.11. [CrossRef]
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