基于相似性的类别学习ERPs研究

Similarity-based Category Learning:Evidence from ERPs

目的:研究类别学习过程中,基于类别相似性的不同时间限制下被试分类学习脑激活机制。方法:通过对15名被试采用事件相关电位技术(ERPs),使用2相似程度不同(高相似vs低相似)×3呈现时间不同(10ms vs 200ms vs 600ms)的多因素实验设计,探讨不同相似程度及刺激呈现时间不同下的类别学习脑机制。结果:类别高相似的脑激活机制更加复杂,激活的脑区更多;刺激呈现时间为10ms的时候被试的波形图与200ms和600ms类似,但是其潜伏期更短,决策速度更快;三种时间条件下都激活了N400,可能存在语义加工。结论:类别学习在视觉加工阶段就已经发生;类别学习过程并非全或无的竞争机制,而是内隐和外显综合加工的结果。

Objective： Categorization is very important cognitive skill. Different categories based on similarity of the time limit, we used ERPs to study the category learning of the brain activation mechanism trial. Methods： 15 participants under ERPswere used to research the neuromechanism of categorizationin different similarity and different time constraints using themulti-factor experimental design of different similarity 2（l-Iigh similarity vs Low similarity）× 3different present time（10ms vs 200ms vs 600ms）. Results： The brain activation mechanism was more complex and more encephalic regions activated when the object of High-Similarity. When stimuli preventative time is 10ms, oscillograph trace was similar with 200ms and 600ms, but more short latency and faster decision-making. All condition are activated N 400 and indicate semantic processing in category learning. Conclusion： Category learning in the visual processing stage has already occurred. Category learning is not all or none of the competition, but implicit and explicit processing of the results of comprehensive.