People often make rapid visual judgments of the properties of surfaces they are going to
walk on or touch. How do they do this when the interactions of illumination geometry with 3 …

Vision must analyze the retinal image over both small and large areas to represent fine-
scale spatial details and extensive textures. The long-range neuronal convergence that this …

In human and non-human primates, higher form vision matures substantially later than
spatial acuity and contrast sensitivity, as revealed by performance on such tasks as figure …

In two completely randomized experiments, subjects were required to judge either which
was the rougher of two abrasive papers or whether two abrasive papers were the same or …

We measured the perceived lightness of target patches embedded in high dynamic range
checkerboards. We independently varied the luminance of checks immediately surrounding …

Long range interactions between texture elements (short, oriented line segments) were
examined. Specifically, we studied the influence of a background array of texture elements …

Perceptual learning is an improvement in perceptual task performance reflecting plasticity in
the perceptual system. Practice effects were studied in two object orientation tasks: a first …

Naturalistic textures with an intermediate degree of statistical regularity can capture key
structural features of natural images. V2 and later visual areas are sensitive to these …

The human visual system is sensitive to both first-order variations in luminance and second-
order variations in local contrast and texture. Although there is some debate about the …

A new psychophysical methodology is introduced, histogram contrast analysis, that allows
one to measure stimulus transformations, f, used by the visual system to draw distinctions …