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The segregation of lateral geniculate nucleus (LGN) axons into
ocular dominance columns is believed to involve a prolonged,activity-dependent sorting process. However, visualization ofearly
postnatal ferret LGN axons by direct LGN tracer injectionsrevealed
segregated ocular dominance columns <7 days after innervationof layer
4. These early columns were unaffected by experimentallyinduced
imbalances in retinal activity, implying that differentmechanisms
govern initial column formation and their modificationduring the
subsequent critical period. Instead of activity-dependentplasticity,
we propose that ocular dominance column formationrelies on the
targeting of distinct axonal populations to definedlocales in cortical
layer 4.
Howard Hughes Medical Institute and Department of Neurobiology,
Duke University Medical Center, Durham, NC 27710, USA.
*
To whom correspondence should be addressed. E-mail:
jcrowley{at}neuro.duke.edu
Visual Experience Is Necessary for Maintenance But Not Development of Receptive Fields in Superior Colliculus.
M. M. Carrasco, K. A. Razak, and S. L. Pallas (2005)
J Neurophysiol
94, 1962-1970
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Mapping Labels in the Human Developing Visual System and the Evolution of Binocular Vision.
M.-A. Lambot, F. Depasse, J.-C. Noel, and P. Vanderhaeghen (2005)
J. Neurosci.
25, 7232-7237
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Early and Rapid Targeting of Eye-Specific Axonal Projections to the Dorsal Lateral Geniculate Nucleus in the Fetal Macaque.
A. D. Huberman, C. Dehay, M. Berland, L. M. Chalupa, and H. Kennedy (2005)
J. Neurosci.
25, 4014-4023
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Early Alcohol Exposure Induces Persistent Alteration of Cortical Columnar Organization and Reduced Orientation Selectivity in the Visual Cortex.
A. E. Medina, T. E. Krahe, and A. S. Ramoa (2005)
J Neurophysiol
93, 1317-1325
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Molecular Organization of the Ferret Visual Thalamus.
H. Kawasaki, J. C. Crowley, F. J. Livesey, and L. C. Katz (2004)
J. Neurosci.
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Complete Restoration of Visual Cortical Responses is Possible Late in Development. Focus on "Recovery of Cortical Binocularity and Orientation Selectivity After the Critical Period for Ocular Dominance Plasticity".
L. M. Chalupa (2004)
J Neurophysiol
92, 1969-1970
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Self-organization Model of Cytochrome Oxidase Blobs and Ocular Dominance Columns in the Primary Visual Cortex.