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Specificity and randomness in the visual cortex Ohki K; Reid RCCurr Opin Neurobiol 2007[Aug]; 17 (4): 401-7Research on the functional anatomy of visual cortical circuits has recently zoomed in from the macroscopic level to the microscopic. High-resolution functional imaging has revealed that the functional architecture of orientation maps in higher mammals is built with single-cell precision. By contrast, orientation selectivity in rodents is dispersed on visual cortex in a salt-and-pepper fashion, despite highly tuned visual responses. Recent studies of synaptic physiology indicate that there are disjoint subnetworks of interconnected cells in the rodent visual cortex. These intermingled subnetworks, described in vitro, may relate to the intermingled ensembles of cells tuned to different orientations, described in vivo. This hypothesis may soon be tested with new anatomic techniques that promise to reveal the detailed wiring diagram of cortical circuits.|*Nonlinear Dynamics[MESH]|Animals[MESH]|Brain Mapping[MESH]|Humans[MESH]|Models, Neurological[MESH]|Nerve Net/*physiology[MESH]|Neurons/*physiology[MESH]|Visual Cortex/cytology/*physiology[MESH] |
