  The Talbot-Plateau law asserts that when the flux (light energy) of a
flicker-fused stimulus equals the flux of a steady stimulus, they will appear
equal in brightness. To be perceived as flicker-fused, the frequency of the
flash sequence must be high enough that no flicker is perceived, i.e., it
appears to be a steady stimulus. Generally, this law has been accepted as being
true across all brightness levels, and across all combinations of flash
duration and frequency that generate the matching flux level. Two experiments
that were conducted to test the law found significant departures from its
predictions, but these were small relative to the large range of flash
intensities that were tested.
