Affiliation:
1. From the Laboratory of Biophysics of Columbia University, New York, and The Biological Laboratories, Harvard University, Cambridge
Abstract
1. The variation of threshold with field area was measured in fields homogeneous in rod-cone composition. At 15° above the fovea, an increase in field diameter from 1° to 5° reduces the threshold sevenfold, at 25° above the fovea tenfold.
2. These changes are shown to follow qualitatively from simple statistical properties of the retinal mosaic. Analytic treatment leads to the expression, (A – nt)k I = C, in which A = area, nt = constant threshold number of elements, I = threshold intensity, and k and C are constants. This equation describes the available data accurately, and is the general form of previous empirical area-threshold formulae.
Publisher
Rockefeller University Press
Cited by
53 articles.
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