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Electrophysiological Evidence of Different Loci for Case Mixing and Word Frequency Effects in Visual Word Recognition

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  • Do word frequency and case mixing affect different processing stages in visual word recognition? Some studies of on line reading suggests that word frequency affects an earlier perceptual, encoding stage and case mixing affects a later central, decision stage (e.g., Reingold, Yang, & Rayner, 2010). Others have suggested otherwise (e.g., Allen, Smith, Lien, Grabbe, & Murphy, 2005; Besner & McCann, 1987). To determine the locus of word frequency and case mixing effects, we manipulated word frequency (high vs. low) and case type (consistent lowercase vs. mixing case in a lexical-decision paradigm. We measured two event-related potential components: the N170 (an early peak occurring 140-240 ms after stimulus onset, related to structural encoding) and the P3 (a late peak occurring 400-600 ms after stimulus onset, related to stimulus categorization). The critical finding is that the N170 amplitude was sensitive to case mixing, but the P3 amplitude was sensitive to word frequency and lexicality. These results suggest that case mixing affects an earlier processing stage than word frequency, at least with respect to lexical-decision processes.
  • Keywords: Case Mixing, Visual Word Recognition, Word Frequency, Event-Related Potentials
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  • Lien, M., Allen, P. A., & Crawford, C. (2012). Electrophysiological evidence of different loci for case-mixing and word frequency effects in visual word recognition. Psychonomic Bulletin & Review, 19(4), 677-684. doi: 10.3758/s13423-012-0251-9
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  • 19
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  • 4
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