Perceptual and Semantic Contributions to Repetition Priming of Environmental Sounds
Perceptual and Semantic Contributions to Repetition Priming of Environmental Sounds
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DOI：
10.1093/cercor/bhp230
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发表时间：
2010-07-01
期刊：
影响因子：
3.7
通讯作者：
Murray, Micah M.
中科院分区：
文献类型：
--
作者：
De Lucia, Marzia;Cocchi, Luca;Murray, Micah M.
环境声音的重复，就像它们的视觉对应物一样，可以促进行为并调节神经反应，这体现了听觉对象如何被表示或访问的可塑性。它仍然是有争议的，这种重复启动/抑制是否涉及仅仅基于声学特征和/或语义特征的可塑性。为了评估物理和语义特征在诱发重复诱导的可塑性中的贡献，本功能磁共振成像（fMRI）研究重复了最初呈现的对象的相同或不同的样本;推理相同的样本共享物理和语义特征，而不同的样本仅共享语义特征。参与者在3 T下进行扫描时执行了一项活的/人造的分类任务。这两种类型的重复刺激显着促进反应时间与初始介绍，表现出知觉和语义重复启动。也有重复抑制功能磁共振成像活动重叠的时间，运动前区，和前额叶区域的听觉“什么”的途径。重要的是，抑制效应的大小是相同的物理和语义相关的范例。重复抑制的程度是无关的知觉和语义信息是否重复的程度是暗示的声学独立的语义分析，在如何保持和检索对象表示。
Repetition of environmental sounds, like their visual counterparts, can facilitate behavior and modulate neural responses, exemplifying plasticity in how auditory objects are represented or accessed. It remains controversial whether such repetition priming/suppression involves solely plasticity based on acoustic features and/or also access to semantic features. To evaluate contributions of physical and semantic features in eliciting repetition-induced plasticity, the present functional magnetic resonance imaging (fMRI) study repeated either identical or different exemplars of the initially presented object; reasoning that identical exemplars share both physical and semantic features, whereas different exemplars share only semantic features. Participants performed a living/man-made categorization task while being scanned at 3T. Repeated stimuli of both types significantly facilitated reaction times versus initial presentations, demonstrating perceptual and semantic repetition priming. There was also repetition suppression of fMRI activity within overlapping temporal, premotor, and prefrontal regions of the auditory "what" pathway. Importantly, the magnitude of suppression effects was equivalent for both physically identical and semantically related exemplars. That the degree of repetition suppression was irrespective of whether or not both perceptual and semantic information was repeated is suggestive of a degree of acoustically independent semantic analysis in how object representations are maintained and retrieved.