The Effects of Age of Acquisition in Korean applied to real time data: Eye tracking Evidence

Hyeree Choo and Sungryong Koh


This study investigated the effect of the age of acquisition of a word on eye fixation duration reading Korean and furthermore analyzed the effect using one-boundary diffusion model. Many studies (Juhasz & Rayner, 2006) showed that the early-acquired words were named more quickly, were decided as word more quickly and were fixated shorter than the late-acquired words. Arguing that the age of acquisition effect of word naming could be reduced to the cumulative frequency effect of a word, some studies showed that the age of acquisition effect disappeared with word naming experiments and simulation studies. In this study, the subjective frequencies of the early-acquired words were closely matched with those of the late-acquired words. We replicated the fact that the early-acquired words were read faster than the late-acquired words. We analyzed the first fixation duration and single fixation duration using a one-boundary diffusion model with such four parameters as boundary(a), start point (z), encoding and response execution time (ter) and drift rate(ν). Since the quality of a word like the age of acquisition would be taken as influencing drift rate, we compared the drift rates of the two conditions individually. We found that the drift rate in the early-acquired words were higher than that in the late-acquired words.