The different P200 effects of phonological and orthographic syllable frequency in visual word recognition in Korean.

The principal purpose of this study was to examine whether event-related potential (ERP) waveform amplitudes at around 200 ms are affected by first-syllable frequency. Another purpose of this study was to investigate whether the source of the amplitude at around 200 ms is phonological syllable frequency or orthographic syllable frequency. The phonological first-syllable frequency and the orthographic first-syllable frequency of Korean pseudo-words were manipulated, and ERPs were collected during a go/no-go lexical decision task. The results of this study showed that the P200 waveform is sensitive to the frequency of the first phonological syllable; specifically, pseudo-words with higher phonological first-syllable frequency produced a lower P200 amplitude than those with lower phonological first-syllable frequency. The orthographic syllable frequency did not affect the P200 waveform. The present result implies that there may be different routes by which phonological syllables and orthographic syllables are processed during the early stage of the visual word recognition process.