@article{ref1,
title="The Relation between Field Brightness and the Speed of Retinal Impression",
journal="Journal of experimental psychology",
year="1923",
author="Cobb, P. W.",
volume="6",
number="2",
pages="138-160",
abstract="The present paper continues the report of an investigation into the problems of retinal sensitivity in which measurement of the shortest time of exposure of a stimulus necessary in order that there may be discrimination between stimulus and no stimulus is adopted as a criterion of sensitivity. The method and apparatus employed were similar to those previously described. There were nine different degrees of illumination of the stimulus-aperture, and five stages in the corresponding brightnesses of the field at the upper range of illumination, and four stages at the lower range. In general, if t represent the threshold time of stimulation, and B the brightness of the experimental field, the relation followed an equation of the form: 1/ t = k log B/ B0, where k and B are constants depending upon experimental conditions. This formula agrees with the laws governing critical flicker-frequency for intermittent stimulation. From Psych Bulletin 20:09:00890. (PsycINFO Database Record (c) 2012 APA, all rights reserved)<p />",
language="",
issn="0022-1015",
doi="10.1037/h0073883",
url="http://dx.doi.org/10.1037/h0073883"
}