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Interactions of stimulus quality and frequency on N400 in Chinese character recognition: Evidence for cascaded
Yong Zhang1, Meiling Zhou2, Quanhong Wang2
1Faculty of Psychology, Southwest University, Chongqing 400715, China; College of International Studies, Southwest University, Chongqing 400715, China; School of Foreign Languages, Southwest University of Political Science and Law, Chongqing 401120, China.
Abstract:
Event-related brain potentials (ERPs) were recorded during a delayed character-matching (target-probe matching) task to examine the joint effects of stimulus quality (blurriness) and character frequency on the N400. The behavioral results indicated robust interactive effects of stimulus quality and character frequency on response times, suggesting the cascade of pre-lexical activation to the lexical stage. The ERP results showed an interaction between stimulus quality and character frequency on N400-like amplitude. As the N400 is basically a marker of semantic processing, these ERP findings suggested that the direct impact of stimulus blurriness on pre-lexical processing could be further cascaded to semantic processing via lexical stage. The converging behavioral and N400 evidence for the interactive effects of stimulus quality and character frequency accords well with the interactive activation (IA) model, in which stimulus quality and character frequency affect at least a common stage in a cascaded processing manner.
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