• Publications
  • Influence
Animal colour vision — behavioural tests and physiological concepts
TLDR
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. Expand
Crepuscular and nocturnal illumination and its effects on color perception by the nocturnal hawkmoth Deilephila elpenor
TLDR
The addition of von Kries color constancy significantly reduced the effect of changing illuminants on chromatic contrast, suggesting that, even in this light-limited environment, the ability of color vision to provide reliable signals under changing illumnants may offset the concurrent threefold decrease in sensitivity and spatial resolution. Expand
Bird colour vision: behavioural thresholds reveal receptor noise
TLDR
The results suggest that chickens use spatial pooling of cone outputs to mitigate photon-shot noise, and the lowest intensity at which chickens can discriminate colours is 0.025 and 0.08 cd m−2 for the orange and green series. Expand
Scotopic colour vision in nocturnal hawkmoths
TLDR
It is shown, through behavioural experiments, that the nocturnal hawkmoth Deilephila elpenor uses colour vision to discriminate coloured stimuli at intensities corresponding to dim starlight, thereby showing colour constancy—a property of true colour vision systems. Expand
Nocturnal Vision and Landmark Orientation in a Tropical Halictid Bee
TLDR
Despite the scarcity of photons, Megalopta is able to visually orient to landmarks at night in a dark forest understory, an ability permitted by unusually sensitive apposition eyes and neural photon summation. Expand
Polarisation-dependent colour vision in Papilio butterflies.
TLDR
The consequences of this eye design for colour vision in behavioural tests find that Papilio spp. Expand
Why ‘false’ colours are seen by butterflies
  • A. Kelber
  • Mathematics, Medicine
  • Nature
  • 18 November 1999
TLDR
To my knowledge, this is the first record of ‘false’ colours being perceived as a result of light polarization, and this detection of false colours may help butterflies to find optimal oviposition sites. Expand
Color discrimination in the red range with only one long-wavelength sensitive opsin
TLDR
It is shown here, through behavioral experiments, that the nymphalid butterfly Heliconius erato, although it expresses short and medium wavelength opsins and only one long wavelength opsin, discriminates colors in the long-wavelength range, whereas another nymphatic, Vanessa atalanta, despite having color vision, is unable to do so. Expand
Light intensity limits foraging activity in nocturnal and crepuscular bees
TLDR
It is shown that the sensitivity of the bee apposition eye is a major factor limiting the ability to forage in dim light, and it is proposed that the evolution of nocturnality in bees was favored by the large variance in the size of females. Expand
Colour spaces in ecology and evolutionary biology
TLDR
A classification of models based on their complexity is proposed, defined as whether and how they model the mechanisms of chromatic adaptation and receptor opponency, the nonlinear association between the stimulus and its perception, and whether or not models have been fitted to experimental data. Expand
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