The contrast thresholds for sine-wave profile gratings were measured as a function of both
the length of the bars and the number of bars of the grating. These factors were found to …

The detectability of contrast increments was measured as a function of the contrast of a
masking or “pedestal” grating at a number of different spatial frequencies ranging from 2 to …

Contrast sensitivity at different positions in the visual field has been measured at various
spatial frequencies using a patch of grating suitably vignetted to give a stimulus localized in …

The contrast threshold for perception of square-wave gratings as depending on spatial
frequency is measured for varying viewing distances, adaptation and exposure time. The …

Results from previous studies measuring the detectability of sinusoidal gratings have been
interpreted by models postulating several sizes of receptive fields. It has not been clear …

Threshold contrasts were determined for pairs of brief, temporally separated gratings of the
same frequency, same or opposite phase, and various contrast ratios. For low spatial …

Human visual sensitivity was measured with sinusoidal gratings in which a constant number
of periods were presented either (1) within a homogeneous surround, the luminance of …

Contrast sensitivity was measured as a function of retinal illuminance (I) for vertical cosine
gratings of various circular areas (A) and spatial frequencies (f⩽ 4 c/deg). Spatial frequency …

Blakemore and Campbell (1969) found that a square-wave adapting grating, unlike a
sinewave grating of the same period, elevates threshold contrast for test gratings whose …

Threshold contrasts were measured psychophysically for a sinusoidal grating target
centered 12° in the peripheral retina. The relationship between contrast sensitivity, the …