Abstract

White light was temporally modulated and subjects gave magnitude estimations of the apparent depth of modulation. Three stimulus parameters were varied: level of time-average luminance, amplitude of modulation, and frequency of modulation. At the lowest luminances, apparent depth of modulation decreased monotonically as modulation frequency increased toward fusion. At the higher luminances, only large amplitudes of modulation produced monotonic functions relating apparent depth of modulation to frequency; smaller amplitudes of modulation produced nonmonotonic functions with maxima in the region of 5–10 Hz. Derived contours relating modulation amplitude to frequency for constant apparent depth of modulation generally resemble functions relating modulation amplitude to frequency for threshold.

© 1970 Optical Society of America

Flicker Sensitivity and Apparent Brightness as a Function of Surround Luminance*

Lewis O. Harvey
J. Opt. Soc. Am. 60(6) 860-864 (1970)

Visual Masking by Low-Frequency Sinusoidally Modulated Light

G. M. SHICKMAN
J. Opt. Soc. Am. 60(1) 107-117 (1970)

Visibility of a Stabilized Target as a Function of Frequency and Amplitude of Luminance Variation*

Ulker Tulunay Keesey
J. Opt. Soc. Am. 59(5) 604-610 (1969)

Effects of Surround Luminance on Perceptual Latency*

Halsey H. Matteson
J. Opt. Soc. Am. 60(8) 1125-1131 (1970)

Effect of Luminance-Matched Wavelength on Depth Discrimination at Scotopic and Photopic Levels of Target Illumination

WILLIAM O. DWYER and ALFRED LIT
J. Opt. Soc. Am. 60(1) 127-131 (1970)