Rapid development and plasticity of layer 2/3 maps in rat barrel cortex in vivo - PubMed (original) (raw)
Rapid development and plasticity of layer 2/3 maps in rat barrel cortex in vivo
E A Stern et al. Neuron. 2001.
Free article
Abstract
Cortical synaptic circuitry develops rapidly in the second postnatal week, simultaneous with experience-dependent turnover of dendritic spines. To relate the emergence of sensory maps to synaptogenesis, we recorded synaptic potentials evoked by whisker deflection in layer 2/3 neurons from postnatal day (P) 12 to 20. At P12, synaptic responses were undetectable. Only 2 days later in life (P14), receptive fields had mature organization. Sensory deprivation, if initiated before P14, disrupted receptive field structure. In layer 4, responses and maps were already mature by P12 and insensitive to deprivation, implying that barrel cortex develops from layer 4 to layer 2/3. Thus, P12-14 is a critical period shared by layer 2/3 synapses and their spines, suggesting that spine plasticity is involved in the refinement of maps.
Comment in
- A new critical period for sensory map plasticity.
Feldman DE. Feldman DE. Neuron. 2001 Aug 2;31(2):171-3. doi: 10.1016/s0896-6273(01)00363-4. Neuron. 2001. PMID: 11502248
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