Task by stimulus interactions in brain responses during Chinese character processing.
Task by stimulus interactions in brain responses during Chinese character processing.
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DOI：
10.1016/j.neuroimage.2012.01.036
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发表时间：
2012-04-02
期刊：
影响因子：
5.7
通讯作者：
Zevin, Jason D.
中科院分区：
文献类型：
--
作者：
Yang, Jianfeng;Wang, Xiaojuan;Shu, Hua;Zevin, Jason D.
在视觉词识别的文献中，各种刺激效应都与行为任务相互作用。例如，在词汇决策任务中，与大声朗读相比，词频的影响被夸大了，而从拼写到发音的规律性的影响被降低了。阅读的神经影像学研究通常独立考察任务和刺激特性对大脑活动的影响，但尚未广泛探索任务需求和刺激效应之间的潜在相互作用。为了解决这个问题，我们使用单词相似度参数变化的刺激进行了词汇决策和符号检测任务，并通过刺激类交互对任务进行了测试。在整个阅读系统中发现了相互作用，例如在词汇决策任务中观察到刺激选择性，但在符号检测任务中却没有。此外，刺激选择模式与任务难度直接相关，因此，对于要求“否”反应的最类似单词的刺激，大脑活动最强，而对于引起快速准确的“是”反应的单词，大脑活动相对较弱。这与主张大脑区域的任务依赖性专业化的模型是一致的，与阅读系统中任务独立性刺激选择性的概念形成对比。
In the visual word recognition literature, it is well understood that various stimulus effects interact with behavioral task. For example, effects of word frequency are exaggerated and effects of spelling-to-sound regularity are reduced in the lexical decision task, relative to reading aloud. Neuroimaging studies of reading often examine effects of task and stimulus properties on brain activity independently, but potential interactions between task demands and stimulus effects have not been extensively explored. To address this issue, we conducted lexical decision and symbol detection tasks using stimuli that varied parametrically in their word-likeness, and tested for task by stimulus class interactions. Interactions were found throughout the reading system, such that stimulus selectivity was observed during the lexical decision task, but not during the symbol detection task. Further, the pattern of stimulus selectivity was directly related to task difficulty, so that the strongest brain activity was observed to the most word-like stimuli that required “no” responses, whereas brain activity to words, which elicit rapid and accurate “yes” responses were relatively weak. This is in line with models that argue for task-dependent specialization of brain regions, and contrasts with the notion of task-independent stimulus selectivity in the reading system.
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