CA3 NMDA receptors are required for the rapid formation of a salient contextual representation.

CA3 NMDA receptors are required for the rapid formation of a salient contextual representation.
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DOI:
10.1002/hipo.20684
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发表时间:
2009-12
期刊:
影响因子:
3.5
通讯作者:
Tonegawa, Susumu
Tonegawa, Susumu
中科院分区:
医学3区
文献类型:
--
作者:
McHugh, Thomas J.;Tonegawa, Susumu

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The acquisition of Pavlovian fear learning engages the hippocampus when the conditioned stimuli are multimodal or temporally isolated from the unconditioned stimuli. By subjecting CA3-NR1 KO mice to conditioning protocols that incorporate time-dependent components we found that the loss of plasticity at recurrent CA3 synapses resulted in a deficits in contextual conditioning specifically when the exposure to the context was brief or when the US was signaled with a competing, predictive unimodal stimulus. Our results suggest CA3 contributes both speed and salience to contextual processing and support the theory of competition between multimodal and unimodal conditioned stimuli for associative learning.
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