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Published byArchibald Ferguson Modified over 8 years ago
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Cortical Plasticity Representational plasticity - induction - mechanisms Hyperacuity - intramodal effects - intermodal effects Clinical relevance Cross-modal plasticity
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Representational plasticity
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Amputation, deafferentation
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- after 2 years Effect of amputation on the cortical representation in SI
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Deafferentation of the glabrous part of D1 and D2 by nerve transection dorsal, hairy silent Area 3b
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Reorganization of the thalamic representation
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Deafferentation of the cortical representation by thalamic lesion
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Experience dependent plasticity Training and learning
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Extensive multidigit stimulation
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Reversibility and dynamics
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Return of esthesia Effect of anesthesia on the size of the RF of an SI neuron
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Effect of amputaion on the RF size in SI
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Mechanisms
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Convergence, divergence
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Relationship of intrinsic cortical connections and peripheral innervation
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Divergence in the major somatosensory pathway
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A possible role for the thalamocortical circuitry in regulating cortical plasticity
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Microstructure of the somatosensory RF
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Unmasking A role for lateral inhibition
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Effect of disruption of local inhibition on the RF size in SI
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Forward masking increases lateral inhibition
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Rapid unmasking by decreasing tonic inhibition
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Synaptic plasticity LTP/LTD
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Upper layer horizontal connections play pivotal role in representational plasticity
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Hyperacuity
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Intramodal effects Amputation, reversible inactivation
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Sensitivity differences between fingers in normal cases
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AMPUTATION Increased representation, better performance?
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Reversible inactivation: callosal interactions Behavior
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Reversible inactivation: callosal interactions Brain activation (EEG)
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Map reorganization Clinical relevance
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Phantom feelings, Phantom pain
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Focal hand dystonia:Writer’s-, Musician’s Cramp
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Aberrant, increased plasticity
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Neuronal basis of map reorganization: unresolved issues
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Cross-modal plasticity Blindness
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Intermodal effects
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Blindness induced somatosensory changes
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Increased tactile sensitivity
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Cross-modal effects
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Axonal rerouting
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Tactile functions of the visual cortex
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Rewiring Subcortical pathways
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Uni- and heteromodal connections Cortical pathways
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Speech processing in the visual cortex
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