A model for the dynamic properties of integrating fibers: Target localization in a three-dimensional space—I. Mathematical description

Schiff, H.; Castelletti, G.; Stefano, Gioia Di; Iacino, L.

doi:10.1016/0300-9629(89)90573-2

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…1) have the most heavily skewed visual axes (Figs. Their visual axes actually cross that of the MB a short distance out from the eye (Schiff et al 1989). Their visual axes actually cross that of the MB a short distance out from the eye (Schiff et al 1989).…”

Section: Patterns Of Optical Axes and Resolutionmentioning

confidence: 94%

Some optical features of the eyes of stomatopods

Marshall

Land

1993

J Comp Physiol A

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Section: Patterns Of Optical Axes and Resolutionmentioning

confidence: 94%

Some optical features of the eyes of stomatopods

Marshall

Land

1993

J Comp Physiol A

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“…Using the model given under Material and Methods and described in detail elsewhere (Schiff et al 1989a) the histograms of the spike discharge patterns were simulated. Simulations were repeated for different distances of the point from the eye for a T2, vertical fiber (Schiff et al 1989b).…”

Section: The T2 Fibermentioning

confidence: 99%

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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“…A decision circuit, partly in parallel, provides the final cue for hitting the prey. The voltage changes in the neural integrators are described (Schiff et al 1989a) by a transfer function which depends on the interface connectivity pattern and the spatio-temporal distribution of inputs. The optics and morphology of the eye and its nervous system in Squilla mantis and the algorithms for the neural integrators are described in the companion paper.…”

Section: Introductionmentioning

confidence: 99%

What the mantis shrimp's eye (possibly) tells its raptorial appendages

1990

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Abstract. On the distal lamina surface of stomatoped eyes a matrix of horizontal and vertical nerve fibers processes the complex input patterns. The output of these integrating fibers is a spike discharge pattern correlated to the input pattern. Here we introduce a ___ neuron which either subtracts or sums the outputs from the set of horizontal and vertical fibers activated at that moment. The output pattern of spike frequencies of the + neuron locates a target in space. Over a parallel channel outputs from the vertical fibers pass a bandpass filter and constitute one of the inputs for a decision neuron. The other input derives from specialized ommatidia at the center of the eye. If both inputs arrive within a short time interval, they sum, the threshold is reached and the decision neuron fires. Spikes from the decision neuron are the final cue for the muscles of the raptorial appendages. The appendages shoot forward and hit the prey with high precision.

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A model for the dynamic properties of integrating fibers: Target localization in a three-dimensional space—I. Mathematical description

Cited by 8 publications

References 22 publications

Some optical features of the eyes of stomatopods

Some optical features of the eyes of stomatopods

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

What the mantis shrimp's eye (possibly) tells its raptorial appendages

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