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  Sensory experience restructures thalamocortical axons during adulthood

Oberlaender, M., Ramirez, A., & Bruno, R. M. (2012). Sensory experience restructures thalamocortical axons during adulthood. Neuron, 74(May 24 2012), 648-655. doi:10.1016/j.neuron.2012.03.022.

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Oberlaender, M.1, Author
Ramirez, A., Author
Bruno, R. M., Author
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1Max Planck Florida Institute for Neuroscience, Max Planck Society, One Max Planck Way, Jupiter FL 33458, USA, ou_1950288              

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Free keywords: Animals, Axons/*physiology, Neural Pathways/physiology, Neuronal Plasticity/*physiology, Neurons/*physiology, Rats, Rats, Wistar, Somatosensory Cortex/*physiology, Synapses/physiology, Thalamus/*physiology, Touch/*physiology
 Abstract: The brain's capacity to rewire is thought to diminish with age. It is widely believed that development stabilizes the synapses from thalamus to cortex and that adult experience alters only synaptic connections between cortical neurons. Here we show that thalamocortical (TC) inputs themselves undergo massive plasticity in adults. We combined whole-cell recording from individual thalamocortical neurons in adult rats with a recently developed automatic tracing technique to reconstruct individual axonal trees. Whisker trimming substantially reduced thalamocortical axon length in barrel cortex but not the density of TC synapses along a fiber. Thus, sensory experience alters the total number of TC synapses. After trimming, sensory stimulation evoked more tightly time-locked responses among thalamorecipient layer 4 cortical neurons. These findings indicate that thalamocortical input itself remains plastic in adulthood, raising the possibility that the axons of other subcortical structures might also remain in flux throughout life.

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 Dates: 2012
 Publication Status: Issued
 Pages: -
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 Rev. Type: Peer
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Title: Neuron
Source Genre: Journal
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Publ. Info: Cambridge, Mass. : Cell Press
Pages: 7 Volume / Issue: 74 (May 24 2012) Sequence Number: - Start / End Page: 648 - 655 Identifier: ISSN: 0896-6273
CoNE: https://pure.mpg.de/cone/journals/resource/954925560565