Visual letter similarity effects in Korean word recognition: The role of distinctive strokes.

While the impact of visual letter similarity on word recognition in the Latin script has been extensively documented using masked priming techniques, research into non-Latin scripts such as Hangul remains limited. Hangul letters are systematically formed by adding one or two strokes to the base form, creating a pool of visually similar letters in the inventory. This study investigated the role of added distinctive strokes in word recognition by employing two experimental tasks: a lexical decision task (Experiment 1) and a same-different word matching task (Experiment 2). The results of Experiment 1 revealed a visual similarity effect only for primes without distinctive strokes, indicating an asymmetry in the priming effects. Conversely, Experiment 2 showed that visually similar primes facilitated target word processing regardless of the presence of the distinctive stroke, indicating no asymmetric priming effect. These findings suggest initial uncertainty of letter identity during Korean word processing and the processing of distinctive strokes in differentiating visually similar words.