Naturally occurring visual stimuli are rich in examples of objects delineated from their
backgrounds simply by differences in luminance, so-called first-order stimuli, as well as …

Second-order textures—patterns that cannot be detected by mechanisms sensitive only to
luminance changes—are ubiquitous in visual scenes, but the neuronal mechanisms …

Channel-based models of human spatial vision require that the output of spatial filters be
pooled across space. This pooling yields global estimates of local feature attributes such as …

What is visual texture, and how might a study of the visual perception of texture help us to
better understand human vision? In this chapter we will attempt to give the reader a feel for …

Single neurons in areas V1 and V2 of macaque visual cortex respond selectively to
luminance-modulated stimuli. These responses are often influenced by context, for example …

At suprathreshold levels, detection and awareness of visual stimuli are typically synonymous
in nonclinical populations. But following postgeniculate lesions, some patients may perform …

The segregation of texture patterns may be carried out by a set of linear spatial filters (to
enhance one of the constituent textures), a nonlinearity (to convert the higher contrast of …

To make vision possible, the visual nervous system must represent the most informative
features in the light pattern captured by the eye. Here we use Gaussian scale–space theory …

Previous analyses of natural image statistics have dealt mainly with their Fourier power
spectra. Here we explore image statistics by examining responses to biologically motivated …

We consider the overall shape of the second-order modulation sensitivity function (MSF).
Because second-order modulations of local contrast or orientation require a carrier signal, it …