Document Detail

Activation of lateral extrastriate areas during orthographic processing of Japanese characters studied with fMRI.
MedLine Citation:
PMID:  9927549     Owner:  NLM     Status:  MEDLINE    
We investigated the early orthographic processing in the occipital cortex using Japanese morphogram by functional magnetic resonance imaging. Kanji (Japanese morphogram) is one system of character used in the Japanese language, each character of which has a specific meaning and pronunciations. To ensure that the effects of the general visual properties of Kanji were excluded from Kanji-related activation, we created strict control stimuli, the "scrambled Kanji" that had the same luminance, contrast, and retinotopical size as those of the original Kanji. In the Kanji vs scrambled Kanji task, we found significant activation in the left inferior occipital gyrus. However, we found no activation in earlier visual cortices, including the primary visual cortex, indicating that the scrambled Kanji served as an effective control stimulus for this task. In the Kanji vs blank screen task, much more areas, including earlier visual cortices, were activated. The activation that we found in the Kanji vs scrambled Kanji task was compatible with the results of previous studies of English letter strings by other groups, suggesting that the left inferior occipital gyrus plays an essential role in orthographic processing common to these two different writing systems.
I Uchida; H Kikyo; K Nakajima; S Konishi; K Sekihara; Y Miyashita
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  NeuroImage     Volume:  9     ISSN:  1053-8119     ISO Abbreviation:  Neuroimage     Publication Date:  1999 Feb 
Date Detail:
Created Date:  1999-03-18     Completed Date:  1999-03-18     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9215515     Medline TA:  Neuroimage     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  208-15     Citation Subset:  IM    
Copyright Information:
Copyright 1999 Academic Press.
Department of Physiology, The University of Tokyo School of Medicine, Tokyo, Hongo, 113-0033, Japan.
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MeSH Terms
Arousal / physiology
Brain Mapping
Dominance, Cerebral / physiology
Evoked Potentials, Visual / physiology
Magnetic Resonance Imaging*
Occipital Lobe / physiology*
Pattern Recognition, Visual / physiology*
Visual Cortex / physiology*
Visual Pathways / physiology

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