Colour coding in the cerebral cortex: The reaction of cells in monkey visual cortex to wavelengths and colours

  title={Colour coding in the cerebral cortex: The reaction of cells in monkey visual cortex to wavelengths and colours},
  author={Semir Zeki},
  • S. Zeki
  • Published 1 August 1983
  • Biology
  • Neuroscience

Primate cortical area V4 important for colour constancy but not wavelength discrimination

The results support the notion that the V4 complex is necessary for colour constancy but not for the discrimination of hue.

Cortical mechanisms of colour vision

These studies are beginning to indicate that colour is processed not in isolation, but together with information about luminance and visual form, by the same neural circuits, to achieve a unitary and robust representation of the visual world.

The position and topography of the human colour centre as revealed by functional magnetic resonance imaging.

It is found that human V4 contains a representation of both the superior and inferior visual fields, and there appears to be retinotopic organization of V4 with the superior visual field being represented more medially on the fusiform gyrus and the inferior field more laterally, the two areas abutting on one another.

The colour centre in the cerebral cortex of man

A comparison of the results of PET scans of subjects viewing multi-coloured and black-and-white displays has identified a region of normal human cerebral cortex specialized for colour vision.

Responses of spectrally selective cells in macaque area V2 to wavelengths and colors.

Although spatiotemporal wavelength comparisons are taking place in the color-specialized subdivisions of area V2, the determination of complete color-constant behavior at the neuronal level requires further processing, in other areas.


Consideration of evidence for third stage mechanisms of colour appearance in visual cortex leads to a discussion of the interaction of colour processing with form and motion processing, colour constancy, cerebral achromatopsia and the role of consciousness in behaviour dependent on colour vision.

Color in the Cortex: single- and double-opponent cells

Modeling the emergence of perceptual color space in the primary visual cortex

This thesis constructs a model of the early visual system that develops based on natural input, and demonstrates that several factors interact to prevent this first model from developing a realistic representation of hue, the first time a model has done so.

Three cortical stages of colour processing in the human brain.

The technique of functional magnetic resonance imaging is used to chart the colour pathways in the human brain beyond V4 and shows that both naturally and unnaturally coloured objects activate a pathway extending from V1 to V4, though not overlapping totally the activity produced by viewing abstract coloured Mondrian scenes.



Spatial and chromatic interactions in the lateral geniculate body of the rhesus monkey.

The opponent principle, in which spatially separated excitatory and inhibitory regions are pitted against each other, has now been observed for retinal ganglion cells in the frog, the lizard, the rabbit, the rat, the ground squirrel, and the monkey.

Colour coding in the superior temporal sulcus of rhesus monkey visual cortex

  • S. Zeki
  • Biology
    Proceedings of the Royal Society of London. Series B. Biological Sciences
  • 1977
It was concluded from these combined anatomico-physiological experiments that there are at least two distinct regions in the superior temporal sulcus which have different afferent connections and functional properties.

Visual responses of area 18 neurons in awake, behaving monkey.

The mechanisms underlying effects of ionizing radiation on visual-motor tasks in combat are not understood but definitely involve some disruption of visual perception and it is possible to identify those parts of the central nervous system necessary for visual perception.

The distribution of wavelength and orientation selective cells in different areas of monkey visual cortex

  • S. Zeki
  • Biology
    Proceedings of the Royal Society of London. Series B. Biological Sciences
  • 1983
The results showed that in VI wavelength selective cells are concentrated in the region of foveal representation (central 0-2°) and decline at increasing eccentricities, and that in the V4 complex the concentration of such cells does not vary with eccentricity.

Ferrier lecture - Functional architecture of macaque monkey visual cortex

  • D. HubelT. Wiesel
  • Biology
    Proceedings of the Royal Society of London. Series B. Biological Sciences
  • 1977
In most respects the above description fits the newborn monkey just as well as the adult, suggesting that area 17 is largely genetically programmed.

Spectral responses of single units in the primate visual cortex.

Spectral response behavior of single units was investigated in the visual cortex of the unanesthetized macaque monkeys with test stimuli of 0.5° in visual angle, and two kinds of units relating to rod receptors were distinguished.

Uniformity and diversity of structure and function in rhesus monkey prestriate visual cortex.

  • S. Zeki
  • Biology
    The Journal of physiology
  • 1978
It is argued that despite its uniformity in cytoarchitectural appearance and in ocular interaction patterns, there is a functional division of labour within the prestriate cortex.