Default network contributions to episodic and semantic processing during divergent creative thinking: A representational similarity analysis
Default network contributions to episodic and semantic processing during divergent creative thinking: A representational similarity analysis
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DOI：
10.1016/j.neuroimage.2019.116499
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发表时间：
2020-04-01
期刊：
影响因子：
5.7
通讯作者：
Schacter, Daniel L.
中科院分区：
文献类型：
--
作者：
Beaty, Roger E.;Chen, Qunlin;Schacter, Daniel L.
认知和神经成像证据表明，情景记忆和语义记忆--分别是对自传体事件和概念知识的记忆--支持创造性思维的不同方面，越来越多的研究报告称，在执行创造性思维任务时，默认网络中的大脑区域被激活。本研究试图通过诱发情景或语义提取定向来分离这些记忆过程的神经作用，然后在功能磁共振成像中执行发散思维任务。我们进行了代表性相似性分析(RSA)来识别神经活动的多体素模式，这些模式在归纳(情景和语义)和想法生成方面是相似的。在行为层面，我们发现语义归纳与增加的想法原创性有关，这是通过计算概念之间的语义距离来评估的。RSA显示，在语义诱导和随后的想法产生过程中，左角回(AG)、后扣带回(PCC)和左侧前下顶叶(IPL)的多体素模式更相似(与情景诱导相比)。相反，在间歇性诱导和随后发生的过程中，左侧海马旁回和右侧IPL前部的活动模式更相似。总而言之，这些发现指出情景记忆和语义记忆过程对创造性认知的独立贡献，并表明默认网络中的不同区域支持发散思维中特定的记忆相关过程。
Cognitive and neuroimaging evidence suggests that episodic and semantic memory-memory for autobiographical events and conceptual knowledge, respectively-support different aspects of creative thinking, with a growing number of studies reporting activation of brain regions within the default network during performance on creative thinking tasks. The present research sought to dissociate neural contributions of these memory processes by inducing episodic or semantic retrieval orientations prior to performance on a divergent thinking task during fMRI. We conducted a representational similarity analysis (RSA) to identify multivoxel patterns of neural activity that were similar across induction (episodic and semantic) and idea generation. At the behavioral level, we found that semantic induction was associated with increased idea originality, assessed via computational estimates of semantic distance between concepts. RSA revealed that multivoxel patterns during semantic induction and subsequent idea generation were more similar (compared to episodic induction) within the left angular gyrus (AG), posterior cingulate cortex (PCC), and left anterior inferior parietal lobe (IPL). Conversely, activity patterns during episodic induction and subsequent generation were more similar within left parahippocampal gyrus and right anterior IPL. Together, the findings point to dissociable contributions of episodic and semantic memory processes to creative cognition and suggest that distinct regions within the default network support specific memory-related processes during divergent thinking.