Hemispheric asymmetry emerges at distinct parts of the occipitotemporal cortex for objects, logograms and phonograms: A functional MRI study

Nakamura, Kimihiro; Oga, Tatsuhide; Okada, Tomohisa; Sadato, Norihiro; Takayama, Yoshihiro; Wydell, Taeko N.; Yonekura, Yoshiharu; Fukuyama, Hidenao

doi:10.1016/j.neuroimage.2004.11.055

Cited by 30 publications

(30 citation statements)

References 43 publications

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“…Our finding of contralateral bias for hemifield-split strings of silhouettes—which, like object images, elicit strong shape-related fMRI responses in visual cortex (Kourtzi & Kanwisher, 2001)—therefore extends previous findings of contralateral bias for objects viewed in isolation to those presented as part of a configuration viewed centrally. Additionally, a whole-brain analysis showed that overall repetition suppression was right-lateralized, consistent with other findings of right-lateralization during object recognition (Nakamura et al, 2005). A second whole brain analysis showed that the degree of contralateral bias was greater in the right hemisphere than in the left.…”

Section: Discussionsupporting

confidence: 89%

An fMRI study of visual hemifield integration and cerebral lateralization

et al. 2017

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The human brain integrates hemifield-split visual information via interhemispheric transfer. The degree to which neural circuits involved in this process behave differently during word recognition as compared to object recognition is not known. Evidence from neuroimaging (fMRI) suggests that interhemispheric transfer during word viewing converges in the left hemisphere, in two distinct brain areas, an “occipital word form area” (OWFA) and a more anterior occipitotemporal “visual word form area” (VWFA). We used a novel fMRI half-field repetition technique to test whether or not these areas also integrate nonverbal hemifield-split string stimuli of similar visual complexity. We found that the fMRI responses of the both the OWFA and VWFA while viewing nonverbal stimuli were strikingly different than those measured during word viewing, especially with respect to half-stimulus changes restricted to a single hemifield. We conclude that normal reading relies on left-lateralized neural mechanisms, which integrate hemifield-split visual information for words but not for nonverbal stimuli.

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Section: Discussionsupporting

confidence: 89%

An fMRI study of visual hemifield integration and cerebral lateralization

et al. 2017

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“…In subsequent years, several research projects have been conducted to verify Hatta's reports. To some of them (just to mention Sakurai (as cited in Nakamura et al 2005)), kanji reading triggers left hemispheric processing, while to others (e.g. Sasanuma; as cited in Nakamura et al 2005) they are processed in the right hemisphere.…”

Section: Neuronal Processes In Japanese Scripts Processingmentioning

confidence: 99%

“…To some of them (just to mention Sakurai (as cited in Nakamura et al 2005)), kanji reading triggers left hemispheric processing, while to others (e.g. Sasanuma; as cited in Nakamura et al 2005) they are processed in the right hemisphere. FMRI 18 studies conducted by Nakamura (2005) showed that logograms act like objects or symbols within the bilateral occipitotemporal cortex (right medial anterior fusiform gyrus), while the leftward-lateralization common to the three types of stimuli -naming logograms, objects and phonograms -only appears during the more global or later processing stages associated with the perisylvian cortex (Nakamura, et al 2005: 12).…”

Section: Neuronal Processes In Japanese Scripts Processingmentioning

confidence: 99%

“…FMRI 18 studies conducted by Nakamura (2005) showed that logograms act like objects or symbols within the bilateral occipitotemporal cortex (right medial anterior fusiform gyrus), while the leftward-lateralization common to the three types of stimuli -naming logograms, objects and phonograms -only appears during the more global or later processing stages associated with the perisylvian cortex (Nakamura, et al 2005: 12). Gauthier, Martin and Chao (as cited in Nakamura et al 2005: 15) argue that the different neuronal clusters of the occipitotemporal area respond to various categories of visual objects, whereas van Turennout (as cited in Nakamura et al 2005) reminds us that the organization of the brain systems for object naming 17 Here, kana. 18 Functional magnetic resonance.…”

Section: Neuronal Processes In Japanese Scripts Processingmentioning

confidence: 99%

“…Brain functioning, and indeed brain structure, is moulded by experience (Butterworth & Tang 2004), meaning that learning shallow and regular orthographies (e.g. Italian, Finnish; Wydell 2000) does not affect brain the same way as learning Chinese (Butterworth & Tang 2004) or Japanese (Nakamura et al 2005). Tan revealed that decreased activation is exhibited in different brain areas in English and Chinese dyslexics during the reading process (Butterworth & Tang 2004).…”

Section: Sanō No Gengoya (mentioning

confidence: 99%

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Developmental Dyslexia vs. Japanese Writing Systems’ Neuronal Processing

Dyszy-Chudzińska

2009

10.14746/il

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This paper is an attempt to explain the neuronal processes engaged in Japanese writing systems processing and its role in developmental dyslexia 1 in the Japanese language. It deals with the question of the hemispheric processing in the Japanese language and explains the mechanisms of developmental dyslexia in the language under discussion. The processes of reading and writing in Japanese will also be presented as they are crucial to a more in-depth understanding of the condition of developmental dyslexia in the Japanese language.

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Neural basis of hierarchical visual form processing of Japanese Kanji characters

Higuchi

Moriguchi²,

Murakami

et al. 2015

Brain and Behavior

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IntroductionWe investigated the neural processing of reading Japanese Kanji characters, which involves unique hierarchical visual processing, including the recognition of visual components specific to Kanji, such as “radicals.”MethodsWe performed functional MRI to measure brain activity in response to hierarchical visual stimuli containing (1) real Kanji characters (complete structure with semantic information), (2) pseudo Kanji characters (subcomponents without complete character structure), (3) artificial characters (character fragments), and (4) checkerboard (simple photic stimuli).ResultsAs we expected, the peaks of the activation in response to different stimulus types were aligned within the left occipitotemporal visual region along the posterior–anterior axis in order of the structural complexity of the stimuli, from fragments (3) to complete characters (1). Moreover, only the real Kanji characters produced functional connectivity between the left inferotemporal area and the language area (left inferior frontal triangularis), while pseudo Kanji characters induced connectivity between the left inferotemporal area and the bilateral cerebellum and left putamen.ConclusionsVisual processing of Japanese Kanji takes place in the left occipitotemporal cortex, with a clear hierarchy within the region such that the neural activation differentiates the elements in Kanji characters' fragments, subcomponents, and semantics, with different patterns of connectivity to remote regions among the elements.

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Hemispheric asymmetry emerges at distinct parts of the occipitotemporal cortex for objects, logograms and phonograms: A functional MRI study

Cited by 30 publications

References 43 publications

An fMRI study of visual hemifield integration and cerebral lateralization

An fMRI study of visual hemifield integration and cerebral lateralization

Developmental Dyslexia vs. Japanese Writing Systems’ Neuronal Processing

Neural basis of hierarchical visual form processing of Japanese Kanji characters

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