RESEARCH ARTICLE


An fMRI Study of Word Reading and Colour Recognition in Different Quadrant Fields



Tadashi Ino*, 1, Ryusuke Nakai2, Takashi Azuma2, Kazuki Tokumoto1, Kiyohide Usami1, Toru Kimura1
1 Department of Neurology, Rakuwakai-Otowa Hospital, Otowachinjicho 2 Yamashina-ku, Kyoto 607-8062, Japan
2 Research Center for Nano Medical Engineering, Institute for Frontier Medical Sciences, Kyoto University, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan


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© Ino et al; Licensee Bentham Open

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the to this author at the Department of Neurology, Rakuwakai-Otowa Hospital, Otowachinjicho 2, Yamashina-ku, Kyoto 607-8062, Japan; E-mail: rakuwadr042@rakuwadr.com


Abstract

This fMRI study analyzed activations for processing of word and colour, which were presented in each of the four quadrants, to investigate anatomical segregation between colour and orientation processing and also to examine the effect of visual stimulus position on brain activations. Main effect of visual category was found in the bilateral extrastriate cortices extending to the left visual word form area (word > colour) and small area of the right ventrolateral prefrontal cortex (colour > word). ROI analysis showed that there was a tendency that V4α, not V4/8, showed a greater response to colours than to words. Main effect of visual fields was found in early visual areas, which showed greater responses to the left than to the right field stimuli and also to the lower than to the upper field stimuli. No significant interactions between visual category and visual fields were found.