Abstract

Various curves relating CFF to log I cross each other when these curves represent different PCF’s (pulse-to-cycle fractions). This was interpreted by Bartley to mean that PCF and conditions of flicker and fusion are not simply related, as has been generally taken for granted. He supposed that, whereas short pulses in a given repetitive cycle would produce flicker and longer pulses would produce fusion, still longer ones would reintroduce flicker, and finally the longest ones would produce fusion. An electronic fusion apparatus producing square waves and varying PCF from 0.02 to 0.98 was used to test this directly. PCF was varied over this range while CFF (and thus cycle length) and intensity were held constant. The supposition was readily confirmed. In addition, data were collected suggesting that the very shortest pulses would produce fusion rather than flicker at some intensity levels.

© 1961 Optical Society of America

Equivalence of Various Pulse-to-Cycle Fractions in Producing Critical Flicker Frequency*

S. Howard Bartley and Thomas M. Nelson
J. Opt. Soc. Am. 50(3) 241-244 (1960)

Photic Driving of the Critical Flicker Frequency*

Mathew Alpern and Sadao Sugiyama
J. Opt. Soc. Am. 51(12) 1379-1385 (1961)

Effect of Contrast on CFF and Apparent Brightness*

Harris Ripps, Ira T. Kaplan, and Irwin M. Siegel
J. Opt. Soc. Am. 51(8) 870-873 (1961)

Study of Flicker by Increment Threshold Technique

Robert M. Boynton, Joseph F. Sturr, and Mitsuo Ikeda
J. Opt. Soc. Am. 51(2) 196-201 (1961)

Interrelationships of Background Area, Target Area, and Target Luminance in Their Effect on the Critical Flicker Frequency of the Human Fovea*

P. J. Foley
J. Opt. Soc. Am. 51(7) 737-740 (1961)