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Receptor noise as a determinant of colour thresholds
Spectral sensitivities, measured under bright conditions, for di–, tri–, and tetrachromatic eyes from a range of animals can be modelled by assuming that thresholds are set by colour opponency mechanisms whose performance is limited by photoreceptor noise, the achromatic signal being disregarded.
Tetrachromacy, oil droplets and bird plumage colours
- M. Vorobyev, D. Osorio, A. Bennett, N. Marshall, I. Cuthill
- Environmental ScienceJournal of Comparative Physiology A
- 1 November 1998
This work examines the advantages of coloured oil droplets, UV vision and tetrachromacy for discriminating a diverse set of avian plumage spectra under natural illumination and finds that Discriminability is enhanced both by tetrACHromacy and coloured oil Droplets.
Interspecific and intraspecific views of color signals in the strawberry poison frog Dendrobates pumilio
- A. Siddiqi, T. Cronin, E. Loew, M. Vorobyev, K. Summers
- BiologyJournal of Experimental Biology
- 15 June 2004
The results indicate that the colors displayed by the various color morphs of D. pumilio are effective signals both to conspecifics and to a model predator.
Animal colour vision — behavioural tests and physiological concepts
- A. Kelber, M. Vorobyev, D. Osorio
- BiologyBiological reviews of the Cambridge Philosophical…
- 1 February 2003
An overview of the methods used to study animal colour vision is given, and how quantitative modelling can suggest how photoreceptor signals are combined and compared to allow for the discrimination of biologically relevant stimuli is discussed.
Detection of coloured stimuli by honeybees: minimum visual angles and receptor specific contrasts
The results suggest that green contrast can be utilized for target detection if target recognition has been established by means of the colour vision system.
Colour thresholds and receptor noise: behaviour and physiology compared
Detection of Fruit and the Selection of Primate Visual Pigments for Color Vision
Comparing different types of color vision for detecting more than 100 plant species consumed by tamarins in Peru shows evidence that both frequency‐dependent selection on homozygotes and heterozygote advantage favor M/L polymorphism and that trichromatic color vision is most advantageous in dim light.
Photoreceptor sectral sensitivities in terrestrial animals: adaptations for luminance and colour vision
This review outlines how eyes of terrestrial vertebrates and insects meet the competing requirements of coding both spatial and spectral information, and looks at spectral tuning and diversification among ‘long-wavelength’ receptors (sensitivity maxima at greater than 500 nm), which play a primary role in luminance vision.
Coloured oil droplets enhance colour discrimination
- M. Vorobyev
- Environmental Science, PhysicsProceedings of the Royal Society of London…
- 22 June 2003
Calculations show that coloured oil droplets increase the number of object colours that can be discriminated, and thus are beneficial for colour vision.
Modelling oil droplet absorption spectra and spectral sensitivities of bird cone photoreceptors
It is shown that the spectral locations of the wavelengths of maximum absorbance of the short- (SWS), medium- (MWS) and long- (LWS) wavelength-sensitive visual pigments and the cut-off wavelengths of their respective C-, Y- and R-type oil droplets can be predicted from the λmax of the ultraviolet- (UVS)/violet- (VS) visual pigment.