Photoreceptors, lightness constancy and color vision

Campenhausen, Christoph von

doi:10.1007/bf00366692

Cited by 28 publications

(16 citation statements)

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“…It has been suggested that all colour vision systems have colour constancy and that colour constancy could have been the driving pressure for the evolution of colour vision (Campenhausen, 1986). Receptor adaptation most probably existed in animals even before colour vision evolved.…”

Section: Discussionmentioning

confidence: 99%

Colour constancy in diurnal and nocturnal hawkmoths

Balkenius

Kelber

2004

Journal of Experimental Biology

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Section: Discussionmentioning

confidence: 99%

Colour constancy in diurnal and nocturnal hawkmoths

Balkenius

Kelber

2004

Journal of Experimental Biology

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“…Innate colour-sensitive responses to objects, sometimes referred to as wavelength-specific behaviours ( §2c), are therefore found where recognition needs to be robust to environmental light changes (Campenhausen 1986;Osorio & Vorobyev 2005), such as for mate and host recognition. For example, female fiddler crabs (Uca mjoebergi) prefer yellow (long-wavelength reflecting) claws to white or grey, with both real and dummy males (Detto 2007).…”

Section: Levels Of Colour Visionmentioning

confidence: 99%

From spectral information to animal colour vision: experiments and concepts

2010

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Many animals use the spectral distribution of light to guide behaviour, but whether they have colour vision has been debated for over a century. Our strong subjective experience of colour and the fact that human vision is the paradigm for colour science inevitably raises the question of how we compare with other species. This article outlines four grades of 'colour vision' that can be related to the behavioural uses of spectral information, and perhaps to the underlying mechanisms. In the first, even without an (image-forming) eye, simple organisms can compare photoreceptor signals to locate a desired light environment. At the next grade, chromatic mechanisms along with spatial vision guide innate preferences for objects such as food or mates; this is sometimes described as wavelength-specific behaviour. Here, we compare the capabilities of di-and trichromatic vision, and ask why some animals have more than three spectral types of receptors. Behaviours guided by innate preferences are then distinguished from a grade that allows learning, in part because the ability to learn an arbitrary colour is evidence for a neural representation of colour. The fourth grade concerns colour appearance rather than colour difference: for instance, the distinction between hue and saturation, and colour categorization. These higher-level phenomena are essential to human colour perception but poorly known in animals, and we suggest how they can be studied. Finally, we observe that awareness of colour and colour qualia cannot be easily tested in animals.

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“…Moreover, even in daylight it could be difficult for dichromatic animals to recognize visual objects by their surface colour under changing lighting conditions. As follows from theoretical considerations, low-dimensional colour vision exhibits a high degree of colour metamerism, thwarting colour constancy under changes in the spectral composition of the illuminant [4][5][6]. This apparently makes the assumption of the significance of colour recognition in dogs (and in dichromatic mammals in general) even less feasible.…”

Section: Introductionmentioning

confidence: 99%

Colour cues proved to be more informative for dogs than brightness

2013

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The results of early studies on colour vision in dogs led to the conclusion that chromatic cues are unimportant for dogs during their normal activities. Nevertheless, the canine retina possesses two cone types which provide at least the potential for colour vision. Recently, experiments controlling for the brightness information in visual stimuli demonstrated that dogs have the ability to perform chromatic discrimination. Here, we show that for eight previously untrained dogs colour proved to be more informative than brightness when choosing between visual stimuli differing both in brightness and chromaticity. Although brightness could have been used by the dogs in our experiments (unlike previous studies), it was not. Our results demonstrate that under natural photopic lighting conditions colour information may be predominant even for animals that possess only two spectral types of cone photoreceptors.

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Photoreceptors, lightness constancy and color vision

Cited by 28 publications

References 1 publication

Colour constancy in diurnal and nocturnal hawkmoths

Colour constancy in diurnal and nocturnal hawkmoths

From spectral information to animal colour vision: experiments and concepts

Colour cues proved to be more informative for dogs than brightness

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