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Dissociation of category versus item priming in face processing: an event-related potential study

机译:人脸处理中类别与项目启动的分离:与事件相关的潜在研究

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摘要

The underlying specificity of visual object categorization and discrimination can be elucidated by studying different types of repetition priming. Here we focused on this issue in face processing. We investigated category priming (i.e. the prime and target stimuli represent different exemplars of the same object category) and item priming (i.e. the prime and target stimuli are exactly the same image), using an immediate repetition paradigm. Twenty-three subjects were asked to respond as fast and accurately as possible to categorize whether the target stimulus was a face or a building image, but to ignore the prime stimulus. We recorded event-related potentials (ERPs) and reaction times (RTs) simultaneously. The RT data showed significant effects of category priming in both face trials and building trials, as well as a significant effect of item priming in face trials. With respect to the ERPs, in face trials, no priming effect was observed at the P100 stage, whereas a category priming effect emerged at the N170 stage, and an item priming effect at the P200 stage. In contrast, in building trials, priming effects occurred already at the P100 stage. Our results indicated that distinct neural mechanisms underlie separable kinds of immediate repetition priming in face processing.
机译:可以通过研究不同类型的重复启动来阐明视觉对象分类和辨别的潜在特殊性。在这里,我们重点关注人脸处理中的这个问题。我们使用立即重复范式研究了类别启动(即启动和目标刺激代表同一对象类别的不同示例)和项目启动(即启动和目标刺激是完全相同的图像)。要求二十三名受试者尽可能快速准确地做出反应,以对目标刺激是面部还是建筑物图像进行分类,而忽略主要刺激。我们同时记录了事件相关电位(ERP)和反应时间(RT)。 RT数据显示,在面孔试验和建筑试验中,类别启动具有显着效果,在面孔试验中,项目引发具有显着效果。关于ERP,在面部试验中,在P100阶段未观察到启动作用,而在N170阶段出现了类别启动作用,在P200阶段出现了项目启动作用。相反,在建筑试验中,启动效应已经在P100阶段发生。我们的结果表明,不同的神经机制是脸部处理中可重复的即时重复启动的基础。

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