January 1983
Volume 24, Issue 1
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Articles  |   January 1983
Stimulus features that determine the visual location of a bright bar.
Investigative Ophthalmology & Visual Science January 1983, Vol.24, 66-71. doi:
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      R J Watt, M J Morgan, R M Ward; Stimulus features that determine the visual location of a bright bar.. Invest. Ophthalmol. Vis. Sci. 1983;24(1):66-71.

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

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Abstract

A modification to the standard vernier target that has a detrimental effect on acuity is described. The addition of an extra bar alongside one of the test bars and directly underneath the other increases thresholds by an amount that is a monotonic function of its luminance. This allows for the hypothesis that the location of a bright bar is a function of some widespread description of the light distribution arising from such a bar on the retina, rather than some local feature of such a distribution. In particular, the data are not consistent with any simple notion of boundary extraction and support the conjecture that position of a bar is assigned to the mean or centroid of its light distribution.

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