identical (e.g., 경계), synonymous (e.g., 감시), visually similar (e.g., 병폐), unrelated (e.g., 참회). Experiment 1 used words.In experiment 1, participants performed a lexical decision task, which asked to make decision that the given word on the monitor was meaningful word in Korean. A reaction time of each trial was measured for the analysis. As the result, the identical preview condition showed the significantly fastest reaction time among the all conditions. Also, a reaction time of the synonymous preview condition was significantly faster than unrelated preview condition, indicating the existence of semantic preview effect. In experiment 2, the study used sentences, as a bigger unit of language. Participants of experiment 2 performed simple sentence reading task. Three kinds of fixation time of target area was measured. The results showed traditional preview effect on the identical preview condition, The synonymous preview condition showed significantly shorter fixation time than unrelated preview condition. It means that the results of experiment 2 also showed semantic preview effect, supporting the results of experiment 1. These results of both experiments indicate that semantic information in parafoveal vision would be extracted while reading Korean.