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Changing patterns of binocular visual connections in the intertectal system during development of the frog, Xenopus laevis

III. Modifications following early eye rotation

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Summary

In the frog, Xenopus laevis, a system of intertectal connections underlies the visual projection from an eye to its ipsilateral tectal lobe and is involved in the topographic representation of binocular visual space. Rotation of one eye in early life may be followed by a radical rearrangement of the connections in this system. The modified pattern which later emerges is that which keeps the visual projection through the ipsilateral eye in topographic registration with the direct visual projection from the contralateral eye to the same tectal lobe. This plasticity requires visual experience.

In this paper we describe the time-course and sequence of events by which this plasticity is effected. Following rotation of one eye in larval animals or in animals undergoing metamorphic climax, the earliest evidence of intertectal modification was found 3–4 weeks after metamorphosis. With increasing intervals after metamorphosis an increasing proportion of animals displayed modified intertectal systems. At intermediate intervals many animals showed partial modifications, which were interpreted as transitional stages in the modification process. Analysis of these transitional stages indicated that the sequence of events involved in the elaboration of a modified intertectal system following the experimental alteration of eye alignment exhibits features in common with rearrangements of the system that occur during normal development in response to growth-related alterations in eye alignment.

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  1. S. Grant

    Present address: Department of Anatomy, Charing Cross and Westminster Medical School, The Reynolds Building, St. Dunstan's Road, W6 8RP, London, UK

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  1. Division of Neurophysiology and Neuropharmacology, National Institute for Medical Research, The Ridgeway, Mill Hill, NW7 1AA, London, UK

    S. Grant & M. J. Keating

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Grant, S., Keating, M.J. Changing patterns of binocular visual connections in the intertectal system during development of the frog, Xenopus laevis . Exp Brain Res 89, 383–396 (1992). https://doi.org/10.1007/BF00228254

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  • DOI: https://doi.org/10.1007/BF00228254

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