The range of contrasts in natural scenes is generally thought to far exceed the limited
dynamic ranges of individual contrast-encoding neurons in the primary visual cortex. The …

It is possible to discriminate between grating contrasts over a 300-fold contrast range,
whereas V1 neurons have very limited dynamic ranges. Using populations of model …

Background When we are viewing natural scenes, every saccade abruptly changes both the
mean luminance and the contrast structure falling on any given retinal location. Thus it …

In the early visual system, a contrast gain control mechanism sets the gain of responses
based on the locally prevalent contrast. The measure of contrast used by this adaptation …

Electrophysiological work by Shapley and Victor (1979) initiated a number of investigations
of the response gain of neurons in the retino-cortical pathways during the 1980s. Albrecht …

Visual experience, which is defined by brief saccadic sampling of complex scenes at high
contrast, has typically been studied with static gratings at threshold contrast. To investigate …

The visual system employs a gain control mechanism in the cortical coding of contrast
whereby the response of each cell is normalised by the integrated activity of neighbouring …

In the primary visual pathway, information is represented in two distinct, complementary
domains, namely “on” and “off” cells. In this work we examine how on and off cells may …

Visual responses are known to depend on stimulus contrast and not simply on the absolute
levels of retinal illumination. Here, we have determined the contrasts that mammalian retinal …

In visual perception, object identification requires both the ability to define regions of uniform
luminance and zones of luminance contrast. Neural processes underlying contrast detection …