Subjective brightness in relation to flash rate and the light-dark ratio.

Visibility of a Fine Line in Intermittent Illumination

“…The subjective variation in brightness which accompanies change in the frequency of intermittent illumination is well known [1]; indeed the similar relation which exists for the appearance of black and white sector discs rotating in steady illumination was first reported by Brucke [2] in 1864. Attempts have been made to utilize the apparent enhanced brightness to facilitate the performance of visual tasks.…”

The dynamic-stimulus advantage of visual symmetry perception

“…Brief light Xashes, say 0.05 s, have been shown to yield a subjective brightness judgment that is higher than that found with longer light exposures, given equal luminance levels (Broca-Sulzer eVect; see Katz, 1964). Similarly, with frequency lower than CFF (critical Xicker frequency), a Xickering stimulus is perceived as brighter than steadily illuminated stimulus (Brücke-Bartley eVect; Bartley, 1938). For these reasons, dynamic stimuli might be perceived as more salient than static stimuli and thus produce better performance.…”

Blackness Enhancement

“…This is an outcome which is more frequent than may be expected to occur by chance ( N = 5, p<.05, binomial test). Therefore, a phenomenon approximating blackness enhancement seems indicated, and, given the segregation of brightness/blackness subsystems noted earlier, these findings can be accommodated within the alternation of response theory (1,2).…”