Angular sensitivity of blowfly photoreceptors: intracellular measurements and wave-optical predictions

Smakman, J.G.J.; Hateren, van Johannes; Stavenga, Doekele G.

doi:10.1007/bf00612641

Cited by 56 publications

(71 citation statements)

References 25 publications

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“…Peripheral filtering started with spatial downsampling of each input frame to an equidistant retinal receptor matrix consisting of 62 × 62 elements according to the experimentally established spatial sensitivity distribution of the individual photoreceptors (Smakman et al 1984) by a two-dimensional Gaussian (σ = 0.75 • ). The receptor distance was 5 pixels with respect to the input frame and thus amounted to 1.25 • .…”

Section: Model Simulationsmentioning

confidence: 99%

Neuronal processing of behaviourally generated optic flow: experiments and model simulations

Kern¹,

Lutterklas²,

Petereit³

et al. 2001

Network: Computation in Neural Systems

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The stimuli traditionally used for analysing visual information processing are much simpler than what an animal sees when moving in its natural environment. Therefore, we analysed in a previous study the performance of an identified neuron in the optomotor system of the fly by using as visual stimuli image sequences that were experienced by the animal while walking in a structured environment. These electrophysiological experiments revealed that the fly visual system computes from behaviourally generated optic flow a rather unambiguous representation of the animal's self-motion. In contrast to conclusions based on simple stimuli, the directions of turns are represented by an interneuron, the HSE cell, quite independent of the spatial layout of the environment and its textural properties when the cell is stimulated with behaviourally generated optic flow. This conclusion is substantiated here by further experimental evidence. Moreover, it is shown that the largely unambiguous responses of the HSE cell to behaviourally generated optic flow can be replicated to a large extent by a network model of the fly's visual motion pathway. These results stress the significance of naturalistic stimuli for analysing what is encoded by neuronal circuits under natural operating conditions.

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Section: Model Simulationsmentioning

confidence: 99%

Neuronal processing of behaviourally generated optic flow: experiments and model simulations

Kern¹,

Lutterklas²,

Petereit³

et al. 2001

Network: Computation in Neural Systems

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show abstract

“…The acceptance angle narrows when the pupil closes, thus increasing spatial acuity upon light adaptation (Hardie, 1979;Smakman et al, 1984) and it shifts the spectral sensitivity of the photoreceptor (Hardie, 1979;Vogt et al, 1982).…”

Section: Pupillary Pigmentmentioning

confidence: 99%

Insect retinal pigments: Spectral characteristics and physiological functions

Stavenga

1995

Progress in Retinal and Eye Research

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“…Firstly, it controls the light flux travelling along the rhabdomere, thus expanding the intensity working range of the photoreceptor (Howard et al 1987). Secondly, it narrows the angular sensitivity of the photoreceptors by absorbing preferentially from higher order waveguide modes (Smakman et al 1984). Thirdly, the blue-green absorbing (Roebroek and Stavenga 1990a) and yellow transmitting (Fig.…”

Section: Introductionmentioning

confidence: 99%

Colour in the eyes of insects

Stavenga

2002

Journal of Comparative Physiology A: Sensory, Neural, and Behav

109

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Many insect species have darkly coloured eyes, but distinct colours or patterns are frequently featured. A number of exemplary cases of flies and butterflies are discussed to illustrate our present knowledge of the physical basis of eye colours, their functional background, and the implications for insect colour vision. The screening pigments in the pigment cells commonly determine the eye colour. The red screening pigments of fly eyes and the dorsal eye regions of dragonflies allow stray light to photochemically restore photoconverted visual pigments. A similar role is played by yellow pigment granules inside the photoreceptor cells which function as a light-controlling pupil. Most insect eyes contain black screening pigments which prevent stray light to produce background noise in the photoreceptors. The eyes of tabanid flies are marked by strong metallic colours, due to multilayers in the corneal facet lenses. The corneal multilayers in the gold-green eyes of the deer fly Chrysops relictus reduce the lens transmission in the orange-green, thus narrowing the sensitivity spectrum of photoreceptors having a green absorbing rhodopsin. The tapetum in the eyes of butterflies probably enhances the spectral sensitivity of proximal long-wavelength photoreceptors. Pigment granules lining the rhabdom fine-tune the sensitivity spectra.

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Angular sensitivity of blowfly photoreceptors: intracellular measurements and wave-optical predictions

Cited by 56 publications

References 25 publications

Neuronal processing of behaviourally generated optic flow: experiments and model simulations

Neuronal processing of behaviourally generated optic flow: experiments and model simulations

Insect retinal pigments: Spectral characteristics and physiological functions

Colour in the eyes of insects

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