(9) Dominance of recognition of words presented on right or left eye
-Comparison of Kanji and Hiragana-
¡¡IPMU 2004 (Information Processing and Management of Uncertainty in Knowledge-Based
Systems 2004) ProceedingsVol.2,pp.1167-1173, 2004-7
¡¡The authors recorded nineteen-channel event-related potentials (ERPs)
during recognition of two types of Japanese character; Kanji (Chinese characters)
and Hiragana (one type of phonetic characters). By field-sequential stereoscopic
3D display with liquid crystal shutter, a word and a non-word were simultaneously
and independently presented to the left (right) eye and right (left) one,
respectively. Each word consists of two Kanji or three Hiragana characters.
Three subjects were instructed to press a button when understanding the
meaning of the visual stimuli after 3000 ms poststimulus. Equivalent current
dipole source localization (ECDL) with three unconstrained ECD was applied
to the ERPs. For both Kanji and Hiragana, the ECDs were localized at the
occipital, lingual and inferior temporal gyri at 200?350ms, and those at
Wernicke¡Çs area at 350?600ms. The latter ECD for one left-handed subject
was located at Wernicke¡Çs homologue. Kanji recognition revealed the activation
of the fusiform and supramarginal gyri which may reflect binocular rivalry
and spatial working memory. During the Hiragana recognition task, one of
the ECDs was located at the angular gyrus which is related to phonological
processing. For one left-handed subject, the inferior parietal ECDs were
localized contralaterally to right-handed ones.