• Publications
  • Influence
Absorption of white light in photoreceptors
A simple averaged correction for white light stimulation is derived, F = kl/(2.3 + kl), which is valid for a wide range of k and l, and therefore applicable to both vertebrate and invertebrate photoreceptors.
Vision in the deep sea
It is not only the intensity of light at different depths, but also its distribution in space, which has been a major force in the evolution of deep‐sea vision, is reviewed in support of the following conclusion.
Seeing better at night: life style, eye design and the optimum strategy of spatial and temporal summation
  • E. Warrant
  • Computer Science, Medicine
    Vision Research
  • 1 May 1999
The model predicts that using optimum spatiotemporal summation the locust can extend its vision to light intensities more than 100,000 times dimmer than if it relied on its optics alone.
Crepuscular and nocturnal illumination and its effects on color perception by the nocturnal hawkmoth Deilephila elpenor
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.
Vision in the dimmest habitats on Earth
  • E. Warrant
  • Geography, Medicine
    Journal of Comparative Physiology A
  • 16 September 2004
Nocturnal habitats are just as rich in visual details as diurnal habitats is, and nocturnal animals have evolved visual systems capable of exploiting them, as future research will no doubt reveal.
An Anatomically Constrained Model for Path Integration in the Bee Brain
A complete circuit for path integration and steering in the central complex of the bee brain is proposed, with anatomically identified neurons suggested for each processing step, and the receptive fields of the newly discovered speed neurons can support path integration for the holonomic motion typical of bee flight.
Scotopic colour vision in nocturnal hawkmoths
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.
Nocturnal Vision and Landmark Orientation in a Tropical Halictid Bee
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.
Warm Eyes Provide Superior Vision in Swordfishes
It is shown that warming the retina significantly improves temporal resolution, and hence the detection of rapid motion, in fast-swimming predatory fishes such as the swordfish.
The eyes of deep-sea fishes and the changing nature of visual scenes with depth.
  • E. Warrant
  • Biology, Medicine
    Philosophical transactions of the Royal Society…
  • 29 September 2000
It is shown that the remarkably prominent foveae and relatively large pupils of bathypelagic fishes give them excellent perception and localization of bioluminescent flashes up to a few tens of metres distant, in a world with almost no food.