Subjects were presented with two gratings with different spatial frequencies and they were
asked to discriminate one from the other. Their ability to discriminate between the gratings …

In two experiments we have determined the discriminability between two sinusoidal gratings
as a function of orientation and spatial frequency differences. Twelve orientation (15° steps) …

The ability of human observers to discriminate differences in the relative phase of the
components of high contrast compound gratings has been investigated. It is found that …

Many properties of contrast detection in human vision may be described with reference to a
set of tuned spatial frequency channels. The spatial sensitivity of the channel with optimal …

Previous studies have suggested that there are narrow-band spatial frequency channels in
human vision. In these studies, the detection of one sinusoidal grating is facilitated by a …

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 …

In standard frequency-discrimination experiments either the retinal spatial frequencies
(cycles per degree) or the object spatial frequencies (real world) could be compared …

These experiments examined the extent to which low spatial frequencies are processed
independently. The assessment was carried out with respect to both detection and …

Previous studies have shown that adaptation to asinusoidal grating raises the contrast
threshold for detecting gratings of similar spatial frequency and causes a shift in the …

This article extends our previous reports that multiple sclerosis can cause a visual
dysfunction better described as a distortion than as a blurring of vision. An earlier paper …