We gathered hyperspectral images of natural, foliage-dominated scenes and converted
them to human cone quantal catches to characterize the second-order redundancy present …

The human visual system encodes the chromatic signals conveyed by the three types of
retinal cone photoreceptors in an opponent fashion. This opponency is thought to reduce …

For some sets of surfaces, the spatial ratios of cone-photoreceptor excitations produced by
light reflected from pairs of surfaces are almost invariant under illuminant changes. These …

For efficient coding, sensory systems need to adapt to the distribution of signals to which
they are exposed. In vision, natural scenes above and below the horizon differ in the …

Neurons in the early stages of processing in the primate visual system efficiently encode
natural scenes. In previous studies of the chromatic properties of natural images, the inputs …

The spatial filtering applied by the human visual system appears to be low pass for
chromatic stimuli and band pass for luminance stimuli. Here we explore whether this …

The color vision of Old World primates and humans uses two cone-opponent systems; one
differences the outputs of L and M cones forming a red–green (RG) system, and the other …

It has been hypothesized that mammalian sensory systems are efficient because they
reduce the redundancy of natural sensory input. If correct, this theory could unify our …

Colour vision in the majority of humans is trichromatic, relying on a comparison of the
quantal absorption in three different types of cone photoreceptors. The first steps in this …

The retina is the most accessible element of the central nervous system for linking behavior
to the activity of isolated neurons. We unraveled behavior at the elementary level of single …