Abstract

Two identical 1° flashes were superimposed upon a steady background of the same size seen foveally. The second flash followed the first after delays ranging from 0 to 200 ms. As the delays increased from 0, the energy required for threshold remained constant up to a critical duration, T_C2. (The magnitude of T_C2 decreased as background luminance increased.) As the delays continued to increase beyond T_C2, the threshold energy increased to a maximum, following the rule that the average luminance remained constant. After the maximum, the threshold energy decreased following another simple rule. At the longer delays, threshold energy was again constant. At all background luminances, the single-flash critical duration T_C1 was about 40% higher than T_C2.

© 1972 Optical Society of America

Increment Thresholds for Two Nonidentical Flashes*

Robert M. Herrick and Charles J. Theisen
J. Opt. Soc. Am. 62(4) 588-593 (1972)

Foveal increment thresholds for multiple flashes*

Robert M. Herrick
J. Opt. Soc. Am. 63(7) 870-878 (1973)

Increment thresholds for multiple identical flashes in the peripheral retina

Robert M. Herrick
J. Opt. Soc. Am. 63(10) 1261-1265 (1973)

Temporal Summation during Dark Adaptation*

Barbara R. Stewart
J. Opt. Soc. Am. 62(3) 449-457 (1972)

Negative Flashes, Positive Flashes, and Flicker Examined by Increment Threshold Technique*

Mitsuo Ikeda and Robert M. Boynton
J. Opt. Soc. Am. 55(5) 560-566 (1965)