Category specificity in early perception: face and word n170 responses differ in both lateralization and habituation properties.
Category specificity in early perception: face and word n170 responses differ in both lateralization and habituation properties.
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DOI：
10.3389/neuro.09.018.2008
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发表时间：
2008
影响因子：
2.9
通讯作者：
McCandliss BD
中科院分区：
文献类型：
--
作者：
Maurer U;Rossion B;McCandliss BD
对面孔和视觉词的N170事件相关电位（ERP）反应提出了关于早期知觉过程中类别特异性加工机制及其神经基础的问题。单词和面孔N170之间的地形差异表明了早期感知中的一种类别特定处理形式-单词N170始终是左偏，而不太一致的证据支持面孔N170的右侧化。此外，面部N170显示连续个体面部的振幅降低，这种习惯化形式可能在不同研究中有所不同，从而有助于解释侧化的不一致性。这种效应在视觉词汇中还未被探索。目前的研究直接对比了相同受试者对单词和面孔的N170反应，考察了类别水平的习惯化和侧化效应。ERP反应的一系列不同的面孔和单词收集在两种情况下：块交替的面孔和单词与纯块的一个类别，旨在诱导类别水平的习惯化。N170振幅的全球和枕时测量表明类别（单词，面孔）和块上下文（交替类别，同一类别）之间的相互作用。N170振幅表现出对面孔的类水平习惯化，而不是单词。此外，纯块上下文减少了右偏侧的脸N170，指向类水平的习惯化作为一个因素，可能会驱动不一致的结果，右偏侧在不同的范式。对于N170这个词，没有发现类似的效果，这表明这种形式的习惯化具有类别特异性。两者合计，地形和习惯化的影响表明不同形式的知觉处理驱动的脸N170和视觉词的形式N170。
N170 event-related potential (ERP) responses to both faces and visual words raises questions about category specific processing mechanisms during early perception and their neural basis. Topographic differences across word and face N170s suggests a form of category specific processing in early perception – the word N170 is consistently left-lateralized, while less consistent evidence supports a right-lateralization for the face N170. Additionally, the face N170 shows a reduction in amplitude across consecutive individual faces, a form of habituation that might differ across studies thereby helping to explain inconsistencies in lateralization. This effect remains unexplored for visual words. The current study directly contrasts N170 responses to words and faces within the same subjects, examining both category-level habituation and lateralization effects. ERP responses to a series of different faces and words were collected under two contexts: blocks that alternated faces and words vs. pure blocks of a single category designed to induce category-level habituation. Global and occipito-temporal measures of N170 amplitude demonstrated an interaction between category (words, faces) and block context (alternating categories, same category). N170 amplitude demonstrated class-level habituation for faces but not words. Furthermore, the pure block context diminished the right-lateralization of the face N170, pointing to class-level habituation as a factor that might drive inconsistencies in findings of right-lateralization across different paradigms. No analogous effect for the word N170 was found, suggesting category specificity for this form of habituation. Taken together, topographic and habituation effects suggest distinct forms of perceptual processing drive the face N170 and the visual word form N170.
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