Magnitude Estimation of the Brightness of Brief Foveal Stimuli

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Science  05 Jan 1962:
Vol. 135, Issue 3497, pp. 42-44
DOI: 10.1126/science.135.3497.42


Eighteen observers judged the apparent brightness of light flashes that varied in both duration and luminance. The median numerical estimations (made relative to a standard flash) confirmed three principles: the reciprocity between luminance and duration (Bloch's law), the enhancement of brightness at about 50 milliseconds (Broca-Sulzer effect), and the power-law relation between brightness and energy (Stevens's law).

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