Susceptibility of memory consolidation during lapses in recall.

Susceptibility of memory consolidation during lapses in recall.
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DOI:
10.1038/ncomms2591
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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自相矛盾的是,可以在学习几个小时后回忆起来的记忆,在形成后的一小段时间内可能变得不可接近。这就提出了关于这些早期记忆缺失在记忆巩固结构中的作用的主要问题。由于缺乏关于失误确切时间的信息,这些问题很难调查。然而,在Lymneea中使用单次试验条件反射范例解决了这个问题。在这里,我们使用电生理和行为实验来揭示在条件作用后30 分钟和2 小时时记忆回忆的丧失。我们表明,只有在这些失误期间,长期记忆的巩固才容易受到外部干扰的干扰。记忆缺失和易感性的这些共同时间点对应于具有不同分子需求的记忆不同阶段之间的转换。我们认为,在分子过渡时期,记忆回忆会减弱,允许新的感觉线索阻止长期记忆的巩固。记忆巩固过程中的记忆缺失是指记忆形成后暂时不可访问的时期。Marra和他的同事研究了软体动物Lymneea的记忆缺失,发现只有在这些缺失期间,记忆的巩固才容易受到外部干扰的干扰。
Memories that can be recalled several hours after learning may paradoxically become inaccessible for brief periods after their formation. This raises major questions about the function of these early memory lapses in the structure of memory consolidation. These questions are difficult to investigate because of the lack of information on the precise timing of lapses. However, the use of a single-trial conditioning paradigm in Lymnaea solves this problem. Here we use electrophysiological and behavioural experiments to reveal lapses in memory recall at 30 min and 2 h post conditioning. We show that only during these lapses is consolidation of long-term memory susceptible to interruption by external disturbance. These shared time points of memory lapse and susceptibility correspond to transitions between different phases of memory that have different molecular requirements. We propose that during periods of molecular transition memory recall is weakened, allowing novel sensory cues to block the consolidation of long-term memory. Memory lapses during memory consolidation are periods when the memory becomes briefly inaccessible after its formation. Marra and colleagues study memory lapses in the mollusc Lymnaea, and find that only during these lapses is consolidation of memories susceptible to interruption by external disturbances.
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