Dissociating explicit and implicit category knowledge with fMRI
Dissociating explicit and implicit category knowledge with fMRI
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DOI：
10.1162/089892903321662958
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发表时间：
2003-05-15
影响因子：
3.2
通讯作者：
Mesulam, MM
中科院分区：
文献类型：
--
作者：
Reber, PJ;Gitelman, DR;Mesulam, MM
对健康志愿者的神经影像学检查发现，根据学习模式是有意的还是偶然的，支持类别知识表达的独立神经系统。两组不同的参与者有意或无意地学习了相同的视觉类别。在分类测试中，使用功能磁共振成像（fMRI）来比较类别成员和非成员引起的大脑活动。在内隐学习之后，当参与者偶然学习了类别时，与非类别刺激相比，观察到新类别刺激的枕叶活动减少。相比之下，在有意学习后，新的分类刺激会引起海马体、右前额叶皮层、左下颞叶皮层、楔前叶和后扣带回的活动增加。尽管两种情况下的分类测试是相同的，但大脑活动的差异表明类别知识的不同表示，具体取决于该类别是有意学习还是隐性学习。
Neuroimaging of healthy volunteers identified separate neural systems supporting the expression of category knowledge depending on whether the learning mode was intentional or incidental. The same visual category was learned either intentionally or implicitly by two separate groups of participants. During a categorization test, functional magnetic resonance imaging (fMRI) was used to compare brain activity evoked by category members and nonmembers. After implicit learning, when participants had learned the category incidentally, decreased occipital activity was observed for novel categorical stimuli compared with noncategorical stimuli. In contrast, after intentional learning, novel categorical stimuli evoked increased activity in the hippocampus, right prefrontal cortex, left inferior temporal cortex, precuneus, and posterior cingulate. Even though the categorization test was identical in the two conditions, the differences in brain activity indicate differing representations of category knowledge depending on whether the category had been learned intentionally or implicitly.