Theta- and delta-band EEG network dynamics during a novelty oddball task.
Theta- and delta-band EEG network dynamics during a novelty oddball task.
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DOI：
10.1111/psyp.12906
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发表时间：
2017-11
期刊：
影响因子：
3.7
通讯作者：
Iacono WG
中科院分区：
文献类型：
--
作者：
Harper J;Malone SM;Iacono WG
虽然在目标检测和新奇处理过程中的P3分量已被广泛研究，但对其底层网络动力学知之甚少。最近的一个认知模型表明，额顶叶和额颞区际连接有关的注意/动作选择和目标相关的记忆更新在P3，分别，但缺乏实证工作来测试这个模型。其他工作表明，在注意力、刺激检测和反应选择过程中，内侧额叶皮层和分布式皮层区域之间的θ-和δ-带连接的重要性，类似的动力学可能是P3相关网络连接的基础。本研究以231对同性双胞胎为研究对象，在视觉任务中，结合古怪的目标和新奇的刺激，评估了功能连接。据推测，目标和新的条件将涉及θ额顶叶连接和内侧额叶θ功率，但目标刺激将引起最强的额颞连接。EEG时间-频率分析显示，与标准相比，在目标和新条件下，θ带额顶叶连接和内侧额叶功率更大，这可能是冲突/不确定性解决过程的指标。在目标条件下，θ波段额颞连接性最大，可能反映了背景更新或刺激反应激活。三角带额中央顶叶连接也最强的目标，这可能是敏感的响应相关的需求。这些结果表明，P3相关的功能网络的存在，是由目标oddballs和新的干扰差异从事。与简单的P3振幅相比，网络测量可以在正常和病理人群中的目标检测/新奇处理期间提供更细致入微的神经动力学视图。
While the P3 component during target detection and novelty processing has been widely studied, less is known about its underlying network dynamics. A recent cognitive model suggests that frontal-parietal and frontal-temporal interregional connectivity are related to attention/action selection and target-related memory updating during the P3, respectively, but empirical work testing this model is lacking. Other work suggests the importance of theta- and delta-band connectivity between the medial frontal cortex and distributed cortical regions during attention, stimulus detection, and response selection processes, and similar dynamics may underlie P3-related network connectivity. The present study evaluated the functional connectivity elicited during a visual task, which combined oddball target and novelty stimuli, in a sample of 231 same-sex twins. It was hypothesized that both target and novel conditions would involve theta fronto-parietal connectivity and medial frontal theta power, but that target stimuli would elicit the strongest fronto-temporal connectivity. EEG time-frequency analysis revealed greater theta-band fronto-parietal connectivity and medial frontal power during both target and novel conditions compared to standards, which may index conflict/uncertainty resolution processes. Theta-band fronto-temporal connectivity was maximal during the target condition, potentially reflecting context updating or stimulus-response activation. Delta-band frontocentral-parietal connectivity was also strongest following targets, which may be sensitive to response-related demands. These results suggest the existence of functional networks related to P3 that are differentially engaged by target oddballs and novel distractors. Compared to simple P3 amplitude, network measures may provide a more nuanced view of the neural dynamics during target detection/novelty processing in normative and pathological populations.
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影响因子：
3
作者：
Cohen, Michael X.
通讯作者：
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作者：
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影响因子：
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