文章基本信息

标题：Segmentation precedes face categorization under suboptimal conditions
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作者：Van Den Boomen, Carlijn ; Fahrenfort, Johannes J. ; Snijders, Tineke M. 等
期刊名称：Frontiers in Psychology
电子版ISSN：1664-1078
出版年度：2015
卷号：6
页码：667-680
DOI：10.3389/fpsyg.2015.00667
出版社：Frontiers Media
摘要：Both categorization and segmentation processes play a crucial role in face perception. However, the functional relation between these subprocesses is currently unclear. The present study investigates the temporal relation between segmentation-related and category-selective responses in the brain, using electroencephalography (EEG). Surface segmentation and category content were both manipulated using texture-defined objects, including faces. This allowed us to study brain activity related to segmentation and to categorization. In the main experiment, participants viewed texture-defined objects for a duration of 800 ms. EEG results revealed that segmentation-related responses precede category-selective responses. Three additional experiments revealed that the presence and timing of categorization depends on stimulus properties and presentation duration. Photographic objects were presented for a long and short (92 ms) duration and evoked fast category-selective responses in both cases. On the other hand, presentation of texture-defined objects for a short duration only evoked segmentation-related but no category-selective responses. Category-selective responses were much slower when evoked by texture-defined than by photographic objects. We suggest that in case of categorization of objects under suboptimal conditions, such as when low-level stimulus properties are not sufficient for fast object categorization, segmentation facilitates the slower categorization process.
关键词：EEG; face processing; Visual System; low; level vision; high; level vision; Categorization