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首页> 外文期刊>Neurobiology of learning and memory >Alpha-gamma phase amplitude coupling subserves information transfer during perceptual sequence learning
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Alpha-gamma phase amplitude coupling subserves information transfer during perceptual sequence learning

机译：感知序列学习期间的Alpha-Gamma相位幅度耦合来自信息传输

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Cross-frequency coupling is suggested to serve transfer of information between wide-spread neuronal assemblies and has been shown to underlie many cognitive functions including learning and memory. In previous work, we found that alpha (8-13 Hz) - gamma (30-48 Hz) phase amplitude coupling (alpha gamma PAC) is decreased during sequence learning in bilateral frontal cortex and right parietal cortex. We interpreted this to reflect decreased demands for visuo-motor mapping once the sequence has been encoded. In the present study, we put this hypothesis to the test by adding a "simple" condition to the standard serial reaction time task (SRTT) with minimal needs for visuo-motor mapping. The standard SRTT in our paradigm entailed a perceptual sequence allowing for implicit learning of a sequence of colors with randomly assigned motor responses. Sequence learning in this case was thus not associated with reduced demands for visuo-motor mapping. Analysis of oscillatory power revealed a learning-related alpha decrease pointing to a stronger recruitment of occipito-parietal areas when encoding the perceptual sequence. Replicating our previous findings but in contrast to our hypothesis, alpha gamma PAC was decreased in sequence compared to random trials over right frontal and parietal cortex. It also tended to be smaller compared to trials requiring a simple motor sequence. We additionally analyzed alpha gamma PAC in resting-state data of a separate cohort. PAC in electrodes over right parietal cortex was significantly stronger compared to sequence trials and tended to be higher compared to simple and random trials of the SRTT data. We suggest that alpha gamma PAC in right parietal cortex reflects a "default-mode" brain state, which gets perturbed to allow for encoding of visual regularities into memory.
机译：建议横频耦合来服务于宽扩展神经元组件之间的信息传递，并且已经被示出为包括学习和存储器的许多认知函数的利益。在以前的工作中，我们发现在双侧前皮层和右侧皮质的序列学习期间，α（8-13Hz） - γ（30-48Hz）相位振幅偶联（αγAC）降低。一旦编码序列，我们将其解释为反映对Visuo-Motor映射的需求减少。在本研究中，我们通过向标准串行反应时间任务（SRTT）添加“简单”条件，为试验提出了测试，以最小的需求对Visuo-Motor映射。我们的范例中的标准SRTT需要一种感知序列，允许隐式学习具有随机分配的电动机响应的一系列颜色。因此，在这种情况下的序列学习与对Visuo-Motor映射的需求降低无关。振荡功率分析显示，在编码感知序列时，振荡能力揭示了与枕形间区域的更强招募的相关α减少。与我们的假设相比，复制我们以前的发现，但与右前部和顶部皮质上的随机试验相比，αGammaPac序列下降。与需要简单电机序列的试验相比，它也趋于较小。我们在单独的队列的休息状态数据中分析了Alpha Gamma Pac。与序列试验相比，右侧皮质右侧皮质的PAC显着较强，与SRTT数据的简单和随机试验相比，趋于更高。我们建议在右边形皮层中的alphaγpac反映了“默认模式”脑状态，这会被扰乱，以便允许将视觉规则的编码到内存中。

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