Abstract
IT is well known that, for constant stimulus duration, the visual threshold intensity, I, is a function of the stimulus area A. In the case of absolute thresholds it has been generally accepted that: (i) for areas up to about 6′, AI = constant (Ricco's law); (ii) for areas between about 6′ and perhaps 20°, AI2 = constant (Piper's law).
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References
Brindley, G. S., J. Physiol., 124, 400 (1954).
Willmer, E. N., Quart. J. Exp. Psychol., 2, Part 2 (May 1950).
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GREGORY, R., CANE, V. A Statistical Information Theory of Visual Thresholds. Nature 176, 1272 (1955). https://doi.org/10.1038/1761272a0
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DOI: https://doi.org/10.1038/1761272a0
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