Dissociative Disturbance in Hangul-Hanja Reading after a Left Posterior Occipital Lesion

Abstract

Since the Korean language has two distinct writing systems, phonogram (Hangul) and ideogram (Hanja: Chinese characters), alexia can present with dissociative disturbances in reading between the two systems. A 74-year-old right-handed man presented with a prominent reading impairment in Hangul with agraphia of both Hangul and Hanja after a left posterior occipital- parietal lesion. He could not recognize single syllable words and nonwords in Hangul, and visual errors were predominant in both Hanja reading and the Korean Boston Naming Test. In addition, he had difficulties in visuoperceptual tests including Judgment of Line Orientation, Hierarchical Navon figures, and complex picture scanning. These findings are consistent with the hypothesis that Hangul reading impairment results from a general visual perceptual deficit. However, this assumption cannot explain why performance on visually complex Hanja was better than performance on visually simple Hanja in our patient. In addition, the patient did not demonstrate higher accuracy on Hanja characters with fewer strokes than on words with more strokes. Thus, we speculate that the left posterior occipital area may be specialized for Hangul letter identification in this patient. This case demonstrates that Hangul-Hanja reading dissociation impairment can occur after occipital-parietal lesions.

Characteristics of Acquired Phonological Dyslexia in Korean

“…에서는 성인 실독증에 관한 연구가 단편적인 사례보고 (Kim, Kang, Hyesuk Cho, et al • Characteristics of Acquired Phonological Dyslexia in Korean Lee, & Kwon, 2008;Kwon et al, 2002;Kwon et al, 2005;Lee et al, 2002;Park & Yoon, 2008;Pyun, Sohn, Jung, & Nam, 2008;Yim et al, 2008)가 대부분이고 환자의 읽기능력을 평가하기 위해 사용된 과제들이 다양하지 못한 경우가 많다. 국내 선행연구에서 사용된 읽기 과제를 살펴보면, 문단을 단순히 읽거나 (Kwon et al, 2002), 단어와 비단어 소리내어 읽기 (Park & Yoon, 2008), 한자 단어와 그 한자를 한글로 변환한 단어 읽기 (Yim et al, 2008)…”