CA3 retrieves coherent representations from degraded input: direct evidence for CA3 pattern completion and dentate gyrus pattern separation.

CA3 retrieves coherent representations from degraded input: direct evidence for CA3 pattern completion and dentate gyrus pattern separation.
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DOI:
10.1016/j.neuron.2013.11.017
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发表时间:
2014-01-22
期刊:
影响因子:
16.2
通讯作者:
Knierim JJ
Knierim JJ
中科院分区:
医学1区
文献类型:
--
作者:
Neunuebel JP;Knierim JJ

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联想记忆的理论表明,成功的记忆存储和回忆取决于两个互补过程之间的平衡:模式分离(以最小化干扰)和模式完成(当呈现部分或退化的输入线索时,检索记忆)。海马CA3区的吸引子电路被认为是这两个过程之间的最终仲裁者。在这里,我们提出了第一个直接的,定量的证据表明,CA3产生的输出模式更接近原来存储的表示比其退化的输入模式从齿状回(DG)。我们同时记录活动的CA3和DG的行为大鼠时,当地和全球的参考框架被放置在冲突。CA3表现出一致的人口对冲突的反应(模式完成),即使其DG输入严重中断(模式分离)。因此,结果证实了海马记忆处理的长期计算模型的标志性预测。
Theories of associative memory suggest that successful memory storage and recall depends on a balance between two complementary processes: pattern separation (to minimize interference) and pattern completion (to retrieve a memory when presented with partial or degraded input cues). Putative attractor circuitry in the hippocampal CA3 region is thought to be the final arbiter between these two processes. Here we present the first direct, quantitative evidence that CA3 produces an output pattern closer to the originally stored representation than its degraded input patterns from the dentate gyrus (DG). We simultaneously recorded activity from CA3 and DG of behaving rats when local and global reference frames were placed in conflict. CA3 showed a coherent population response to the conflict (pattern completion), even though its DG inputs were severely disrupted (pattern separation). The results thus confirm the hallmark predictions of a longstanding computational model of hippocampal memory processing.
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