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Monday, July 20, 2020 | History

3 edition of Computer simulations of retinotectal maps in goldfish found in the catalog.

Computer simulations of retinotectal maps in goldfish

A. Edward Friedman

Computer simulations of retinotectal maps in goldfish

by A. Edward Friedman

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Published .
Written in English

    Subjects:
  • Optic nerve.,
  • Visual evoked response.,
  • Goldfish.

  • Edition Notes

    Statementby A. Edward Friedman.
    Classifications
    LC ClassificationsMicrofilm 94/2700 (Q)
    The Physical Object
    FormatMicroform
    Paginationvii, 103 leaves
    Number of Pages103
    ID Numbers
    Open LibraryOL1242141M
    LC Control Number94628901

      Computer simulations suggest that a combination of positional cues and activity-dependent mechanisms gives rise to a very precise retinotectal topology in a variety of experimental situations (, ), for example even if a molecular gradient is only transiently expressed during the initiation of innervation of the by: 4. However, in the biological case the width of the stripes is unaffected. It is worth mentioning that there is some evidence that in reality in cats and monkeys, the development of a retinotopic map, orientation columns and ocular dominance stripes is a 3-stage process ( by: 6.

    (). Normal numbers of retinotectal synapses during the activity-sensitive period of optic regeneration in goldfish: HRPEM evidence implicating synapse rearrangement and collateral elimination during map refinement. (). Ocular dominance column development: Analysis and simulation. ().Author: Kenneth D. Miller and David J. C. MacKay. Scope: This bibliography contains references to computational models of cortical map formation, such as topographic maps, ocular dominance, orientation columns, and somatosensory maps. Papers in this bibliography either explicitely refer to cortical structures or they contain relevant theoretical considerations. This bibliography does not include theoretical papers of a more .

    Topographic mapping in the retinotectal projection by means of complementary ligand and receptor gradients: a computer simulation study. J. Theor. Biol. ; Cited by: Retinotectal Specificity: Models and Experiments in Search of a Mapping Function Retinotectal Specificity: Models and Experiments in Search of a Mapping Function Fraser, Scott E.; Hunt, R. Kevin Jenkins Biophysical Laboratories, The Johns Hopkins University, Embryonic development of nerve patterns has fascinated and frustrated neurobiologists for .


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Computer simulations of retinotectal maps in goldfish by A. Edward Friedman Download PDF EPUB FB2

Retinal ganglion cells in the vertebrate eye connect with tectal cells in a continuously ordered fashion. Experiments performed on goldfish and amphibians, in particular experiments involving the r.

Additionally, constraints are imposed to keep synaptic weights finite. The model is applied to a set of eleven experiments on the regeneration of the retinotectal projection in goldfish.

Self-organizing Neural Maps: From Retina to Tectum describes the underlying processes that determine how retinal fibers self-organize into an orderly visual map. The formation of neural maps is a fundamental organizing concept in neurodevelopment that can shed light on developmental mechanisms and the functions of genes elsewhere.

In these experiments, partial retinal or tectal ablations in goldfish results in the expansion or compression of the retinotectal map, respectively (Sharma.

This proposal has been tested by extensive computer simulations, which correctly describe normal and experimentally perturbed development in many different situations by means of a single algorithm and one set of parameter values.

Fraser, S.E., R.K. Hunt () Retinotectal specificity: Models and experiments in search of a mapping function Cited by: 5.

The development of retinotectal maps: A review of models based on molecular gradients GEOFFREY J. GOODHILL1 & JUN XU2 1Queensland Brain Institute, Department of Mathematics, and Institute for Molecular Bioscience, University of Queensland, St.

Lucia, Australia, and 2Department of Neuroscience, Georgetown. The retinotectal projection, which topographically maps retinal axons onto the tectum of the midbrain, is an ideal model system with which to investigate. Position and proximity in the development of maps and stripes. Author links Such co-operation among chemically similar presynaptic terminals has been shown in computer simulation to produce both maps and stripes.

Schmidtal has claimed that the precise point-to-point order is absent in the retinotectal projection of goldfish if the Cited by: This site provides auxiliary materials, such as source codes for case studies and exercise problems, for the book Computer Simulations of Dislocations.

This site provides auxiliary materials, such as source codes for case studies and exercise problems, for the book Computer Simulations of Dislocations. Covers all the typical problems small business owners and computer users will encounter that they can expect to solve themselves Designed to cover all aspects of small business computing More than just a quick-fix manual for the do-it-yourselfer, this book covers all aspects of small business computing.

The Handbook of Computer Troubleshooting is a complete guide for Reviews: 2. In addition to the normal development and regeneration of the retinotectal map, the model simulates the compressed, expanded, translocated, and rotated maps that have been found in. Patterning of retinotectal connections in the vertebrate visual system Scott E.

Fraser California Institute of Technology, Pasadena, California, USA Recent work on the retinotectal projection clearly establishes the roles of neuronal activity and position-based cues in the patterning of nerve by:   In the broadest sense, computational neuroanatomy is the application of computational techniques (e.g.

analysis, visualization, modeling, and simulation) to the investigation of neural structure. Within the field of computational neuroscience, computational neuroanatomy is principally considered to aim at creating anatomically accurate models of the. Hope RA, Hammond BJ, Gaze RM (): The arrow model: Retinotectal specificity and map formation in the goldfish visual system.

Proc Roy Soc Lond B – CrossRef Google Scholar Ide CF, Fraser SE, Meyer RL (): Eye dominance columns formed by an isogenic double-nasal frog by: 1. The retinotectal projection of the goldfish normally regains a high degree of spatial precision after regeneration of a cut optic nerve, but it fails to do so if retinal ganglion cell activity is blocked by tetrodotoxin, or if local correlations in activity are masked by the synchronizing effect of stroboscopic by: ().

Topographic mapping in the retinotectal projection by means of complementary ligand and receptor gradients: a computer simulation study. Topographic maps are fundamental to sensory processing.

Topographic polarity of the optic tectum studied by reimplantation of the tectal tissue in adult : Dmitry Tsigankov and Alexei A Koulakov.

DISCUSSION The principal findings of this study are that (1) blocking activity during regeneration of the optic nerve in goldfish does not affect the overall 35 organization of the retinotectal map but produc- es a dramatic enlargement of the multiunit re- ceptive fields recorded in the tectum, (2) the ef- fect is not self-correcting upon release from block, but can be reversed by Cited by: The Arrow Model: Retinotectal Specificity and Map Formation in the Goldfish Visual System: Authors: Hope, R.

A.; Experiments performed on goldfish and amphibians, in particular experiments involving the rotation of tectal grafts, have been interpreted by some authors as indicating that the tectum is 'specified'.

We present in this paper. The arrow model: retinotectal specificity and map formation in the goldfish visual system BY R. HOPE, B. HAMMOND AND R. GAZE, F.R.S. National Institute for Mledical Research, The Ridgeway, Mill Hill, London NVW7 1AA (Received 26 January ) Retinal ganglion cells in the vertebrate eye connect with tectal cells in a continuously ordered fashion.

Palm Notebook saves notes on your phone instead of on the cloud. You can write notes on your phone and on a PC connected to the same WIFI ry: TOOLS. Results of computer simulation of the model are related to experimental data obtained from tectal and retinal graft and lesion studies and comparisons are also made with other models.

R.A., Hammond, B.J., & Gaze, F.R.S. The arrow model: retinotectal specificity and map formation in the goldfish visual system. Arbib M.A. ( Cited by: 9. This paper presents XBAM (the Extended Branch-Arrow Model), a new model of the development of the retino-tectal topographic mapping as observed in frog, toad, and goldfish visual systems.

The updating process employed by XBAM is distributed in nature and depends upon interactions between branches of retinal fibers, the branches and the Cited by:   The two computer simulations (with the broad peak of ligand density on the SC and the trough of receptor density on the retina) showed the same abnormal shifts at the nasal and temporal extremes in the topographic map that were close to the experimental results of knock-out mice (Figs.

7J-L, 8J-L, open, solid circles).Cited by: