Possible monocular range-finding mechanisms in stomatopods from different environmental light conditions

Schiff, H.; Abbott, B. C.; Manning, Raymond B.

doi:10.1016/0300-9629(85)90036-2

Cited by 28 publications

(19 citation statements)

References 23 publications

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“…In a column across the mb, om are not all perpendicular to the cornea but are arranged in a characteristic skewing pattern ( Fig. 4a, b, e, f) which depends on the size of the animal, the species and the amount of light available in the environment (Schiff et al, 1985;Schiff, 1989a;Schiff & Di Stefano, 1992;Marshall & Land, 1993a). In turn, this skewing pattern determines a pattern of visual fields which in some areas strongly overlap and in others are separated by blind regions (Schiff et al, 1986c).…”

Section: Shallow Subtidal Environmentmentioning

confidence: 97%

“…Skewing is stronger in species from dim than in those from bright habitats (Schiff, 1989a). Thus stomatopod species from dim light habitats show more overlap of visual fields than those from bright habitats (Schiff et al, 1985;Schiff, 1987Schiff, , 1989a. Skewing patterns as well as the size of om change with growth in such a way that the distance of a critical region for prey capture matches the lengths of the raptorial appendages (Schiff etal., 1989a, b).…”

Section: Shallow Subtidal Environmentmentioning

confidence: 98%

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An introductory survey of ecology and sensory receptors of tropical eastern pacific crustaceans

Schiff

Hendrickx

1997

Italian Journal of Zoology

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A comparative survey of sensory organs (mainly visual) of 35 species of crustaceans (Mysidacea, Stomatopoda and Decapoda) was initiated in the SE Gulf of California, Mexico, an enclosed sea which has been well studied for its physical conditions and the taxonomy of crustacean species. The purpose of this survey was to study how the perceptive capacities are conditioned by the signals arriving from their environment. Studied species were sampled from terrestrial, intertidal, subtidal and deep sea habitats. Our data indicate that down to 200 m there seems to be not much difference of skewing patterns in stomatopods. Eyes are adapted to local conditions. In crabs and stomatopods, ommatidia are aligned in a vertical array along the longer axis of the eye. Visual fields of ommatidia overlap. This could emphasize, for instance, the horizontal motion of vertical edges. Deep-sea crustaceans still have eyes, but in the same habitat species with apparently functional eyes occur together with species with strongly reduced eyes. When eyes are reduced, nervous structures are still observable but not ommatidia. Almost all species studied have extra-organs in the eye. These are mechano-(crabs) or chemo-(deep-sea crustaceans) receptors or else organs which seem to have a specific (e.g. adaptation) visual task (shrimps). All extra-organs have small ganglia and nerves contacting the visual ganglia on their way towards the brain.

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Section: Shallow Subtidal Environmentmentioning

confidence: 97%

Section: Shallow Subtidal Environmentmentioning

confidence: 98%

An introductory survey of ecology and sensory receptors of tropical eastern pacific crustaceans

Schiff

Hendrickx

1997

Italian Journal of Zoology

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“…The first two ventral rows of skewed ommatidia form an angle (towards the middle band) of 71° and 78°, respectively, looking upward. Optical axes cross those of the middle band and of the other half of the eye, as in all stomatopods (Schiff et al, 1985). Towards the tips of the eyes skewing decreases, but most ommatidia in the dorsal half look downward.…”

Section: Optical Axesmentioning

confidence: 99%

“…The ommatidia next to the middle band are always skewed and their optical axes cross those of the middle band and of the other side (Schiff et al, 1985). This means that many visual fields are superimposed, while in other regions of the eye blind regions separate visual fields (Iacino et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

A mantis shrimp wearing sun‐glasses

Schiff

Dore

Donna

2002

Italian Journal of Zoology

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“…The skewing pattern (Abbott et al 1984;Schiff et al 1985) of ommatidia causes complex neural input patterns, different for different distances and positions of a target and for different species (Schiff and Candone 1986;Schiff et al 1986b;Schiff and Abbott 1989). Assuming a Gaussian-shaped graded potential (Goetz 1965;Snyder 1979) as the angular sensitivity function of a retinular cell, this potential would be transferred to the neurocartridge in the lamina.…”

Section: Introductionmentioning

confidence: 97%

A neural model for localizing targets in space accomplished by the eye of a mantis shrimp

1990

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Abstract. Stomatopods locate prey, within a short range of distances, with one eye and strike it within a few milliseconds. We developed a model based on the complex input patterns of the eye transferred to a matrix of neural integrators called T2 and T3 fibers. In the integrators graded potentials are summed and generate spikes if the sum reaches threshold. Histograms of instantaneous frequencies were simulated on a PC for the T2 and for the T3 fibers for motion of a luminous point parallel to the T2 fibers and for approach of the point towards the eye. Position, size, speed of motion and distance of the target could be extracted from the frequency-pattern-coded output of the integrators in our model. A critical region in front of the center of the eye could be defined. This region is elliptical in shape and adapted to the size of the animal (respectively to the size of its raptorial appendages). We assume that prey is hit when it is in the critical zone. Histological and electrophysiological results seem to confirm our model.

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Possible monocular range-finding mechanisms in stomatopods from different environmental light conditions

Cited by 28 publications

References 23 publications

An introductory survey of ecology and sensory receptors of tropical eastern pacific crustaceans

An introductory survey of ecology and sensory receptors of tropical eastern pacific crustaceans

A mantis shrimp wearing sun‐glasses

A neural model for localizing targets in space accomplished by the eye of a mantis shrimp

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