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Overrepresentation of the central visual field in the superior colliculus of the pigmented and albino ferret

Published online by Cambridge University Press:  02 June 2009

C. Quevedo ,
K.-P. Hoffmann ,
R. Husemann  and
C. Distler
C. Quevedo
Affiliation:
Allgemeine Zoologie und Neurobiologie, Ruhr-Universität Bochum, 44780 Bochum, Germany
K.-P. Hoffmann
Affiliation:
Allgemeine Zoologie und Neurobiologie, Ruhr-Universität Bochum, 44780 Bochum, Germany
R. Husemann
Affiliation:
Institut für Neuroinformatik, Ruhr-Universität Bochum, 44780 Bochum, Germany
C. Distler
Affiliation:
Allgemeine Zoologie und Neurobiologie, Ruhr-Universität Bochum, 44780 Bochum, Germany
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Abstract

We have examined the retinotopy in the superior colliculus of pigmented and albino ferrets using both anatomical and electrophysiological methods. While the distribution of contralaterally projecting retinotectal ganglion cells is characterized by the presence of an area centralis superimposed on a visual streak in both strains, the ipsilateral projection from temporal hemiretina is strongly reduced in albinos. In spite of the significantly altered retinotectal projection pattern, the collicular visual field map in the albino ferret reveals the same characteristics as in the pigmented animal with a strongly enlarged representation of the center of visual space. An areal comparison between retinotectal ganglion cell distribution and collicular areal magnification shows that the increase in areal magnification factor between the periphery and the representation of the central visual hemifield exceeds the corresponding increase in retinal ganglion cell density between peripheral retina and area centralis by a factor of three in pigmented and a factor of four in albino ferrets. The areal magnification factor of the representation of the retinal visual streak does not exceed the increase in retinotectal ganglion cell density. Thus, our results suggest that the representation of visual space in the superior colliculus of albino and pigmented ferrets does not simply follow the retinotectal ganglion cell density, but that there is an enhanced representation of the frontal central visual field. The possibility is discussed that the collicular visual field map may be determined either by both retinotectal and corticotectal projections or by the colliculus' intrinsic structure.

Keywords

TopographyMagnificationRetinotectalGanglion cellMap
Type
Research Articles
Information
Visual Neuroscience , Volume 13 , Issue 4 , July 1996 , pp. 627 - 638
Copyright
Copyright © Cambridge University Press 1996

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