Experience-Dependent, Layer-Specific Development of Divergent Thalamocortical Connectivity.

Experience-Dependent, Layer-Specific Development of Divergent Thalamocortical Connectivity.
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DOI:
10.1093/cercor/bhu031
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发表时间:
2015-08
期刊:
Cerebral cortex (New York, N.Y. : 1991)
影响因子:
--
通讯作者:
Daw MI
Daw MI
中科院分区:
其他
文献类型:
--
作者:
Crocker-Buque A;Brown SM;Kind PC;Isaac JT;Daw MI

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The main input to primary sensory cortex is via thalamocortical (TC) axons that form the greatest number of synapses in layer 4, but also synapse onto neurons in layer 6. The development of the TC input to layer 4 has been widely studied, but less is known about the development of the layer 6 input. Here, we show that, in neonates, the input to layer 6 is as strong as that to layer 4. Throughout the first postnatal week, there is an experience-dependent strengthening specific to layer 4, which correlates with the ability of synapses in layer 4, but not in layer 6, to undergo long-term potentiation (LTP). This strengthening consists of an increase in axon branching and the divergence of connectivity in layer 4 without a change in the strength of individual connections. We propose that experience-driven LTP stabilizes transient TC synapses in layer 4 to increase strength and divergence specifically in layer 4 over layer 6.
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