@article{ref1,
title="The Relation Between Field Brightness and the Speed of Retinal Impression--II",
journal="Journal of experimental psychology",
year="1925",
author="Cobb, P. W.",
volume="8",
number="2",
pages="77-108",
abstract="In 1923 the writer of the present article reported having found, in experimenting with the visibility of a black dot on a white screen, that the reciprocal of the exposure-time necessary that the dot should be seen was proportional, at least within certain limits, to the logarithm of the field brightness. The writer now reports a similar experiment, on the speed with which the retinal impression occurs. In this case the law seems to be &quot;… that the reciprocal of the threshold time increases equally with equal increases in the logarithm of the brightness.&quot; The effect of pre- and post-exposure patterns was to increase the threshold time; a constant increase in the size of all the stimuli tended to reduce it to a minimum. The writer points out that since there were rather wide individual variations among his seven subjects his average values &quot;… may be considered only relatively, as with reference to changes in threshold time or 'speed' with changes in brightness.&quot; From Psych Bulletin 23:02:00030. (PsycINFO Database Record (c) 2012 APA, all rights reserved)<p />",
language="",
issn="0022-1015",
doi="10.1037/h0075874",
url="http://dx.doi.org/10.1037/h0075874"
}