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Sensory maps in neocortex are adaptively altered to reflectrecent experience and learning. In somatosensory cortex, distinctpatterns of sensory use or disuse elicit multiple, functionallydistinct forms of map plasticity. Diverse approachesgenetics,synaptic and in vivo physiology, optical imaging, and ultrastructuralanalysissuggest a distributed model in which plasticityoccurs at multiple sites in the cortical circuit with multiplecellular/synaptic mechanisms and multiple likely learning rulesfor plasticity. This view contrasts with the classical modelin which the map plasticity reflects a single Hebbian processacting at a small set of cortical synapses.
1 Division of Biological Sciences, University of California, San Diego, 9500 Gilman Drive, Room 0357, La Jolla, CA 92093, USA. 2 Department of Neuroscience, Erasmus MC, Postbus 1738, 3000 DR Rotterdam, Netherlands.
* To whom correspondence should be addressed. E-mail: dfeldman{at}ucsd.edu
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