[A specific disorder in Kanji writing in a learning disabled child with a visual cognition disorder--a cognitive-neuropsychological and electrophysiological analysis].
We reported a learning disabled child with a specific disorder involving Kanji writing. The patient was a 13-year-old boy. Although he manifested generally normal intellectual ability and his performance on WISC-R indicated that VIQ was 101 and PIQ 84, he could only write approximately 20% of Kanji, which he learned at age 6 to 7. On cognitive-psychological tests, he showed a visual cognition disorder that was different from that in a previously reported case during information processing. Electrophysiologically, he showed a disorder in visual task-relevant potentials. The mechanism underlying this patient appears to be a retrieval disorder for complex graphic forms in addition to a visual cognition disorder because of two reasons. One is that he could distinguish Kanji from similar graphic forms. The other is that he could read Kanji aloud.
Uno
A
A
National Institute of Mental Health, National Center of Neurology and Psychiatry Ichikawa, Chiba.
Kaga
M
M
Inagaki
M
M
Kaneko
M
M
Haruhara
N
N
Matsuda
H
H
D000293:Adolescent; D005074:Evoked Potentials, Visual; D006801:Humans; D007806:Language Disorders / Q000503:physiopathology*; D007859:Learning Disabilities / Q000503:physiopathology*; D008297:Male; D010468:Perceptual Disorders / Q000503:physiopathology*; D011581:Psychological Tests; D014796:Visual Perception