Effects of monocular occlusion and diffusion on visual system development in the cat |
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| Authors: | William G. Christen George D. Mower |
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| Affiliation: | 1. Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE, USA;2. Center for Magnetoencephalography, UNMC, Omaha, NE, USA;1. Laboratory of Molecular Neurobiology and Biophysics and Howard Hughes Medical Institute, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA;1. Department of Soil and Water Sciences, China Agricultural University, Beijing, 100193, PR China;2. Department of Earth Sciences, Memorial University St. John''s, Newfoundland and Labrador, A1B 3X5, Canada;1. Radiation Biology & Health Sciences Division, Modular Laboratories, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India;2. Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India;1. Computation in Neural Circuits Group, Max Planck Institute for Brain Research, Max-von-Laue-Str. 4, 60438 Frankfurt, Germany;2. School of Life Sciences Weihenstephan, Technical University of Munich, 85354 Freising, Germany |
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| Abstract: | The effects of two forms of monocular deprivation (occlusion or diffusion) on visual system development were investigated. One group of cats monocularly deprived of all form stimulation but permitted diffuse light stimulation (diffusion, n = 4) during development showed a pattern of deficits similar to those reported for monocularly sutured cats. Most cells in the visual cortex were driven exclusively by the non-deprived eye and there were eye-specific deficits in X-cell acuity, proportion of Y-cells, and cell body size (binocular and monocular segment) in the lateral geniculate nucleus (LGN). A second group of cats monocularly deprived of all form and light stimulation (occlusion, n = 4) during development showed a less severe pattern of deficits. There was no acuity loss in LGN X-cells driven by the deprived eye, and cell body shrinkage was of smaller magnitude than in diffusion reared cats and was restricted to the binocular segment. Cortical deficits and LGN Y-cell loss were similar in the two groups. The results are consistent with the idea that monocular occlusion produces only deficits due to binocular competition while monocular diffusion reflects the combined effects of binocular competition and abnormal stimulation. |
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| Keywords: | Monocular deprivation Visual cortex Lateral geniculate nucleus Amblyopia Visual development Visual pathway |
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