Recognition and reading aloud of kana and kanji word: An fMRI study

It has been proposed that different brain regions are recruited for processing two Japanese writing systems, namely, kanji (morphograms) and kana (syllabograms). However, this difference may depend upon what type of word was used and also on what type of task was performed. Using fMRI, we investigated brain activation for processing kanji and kana words with similar high familiarity in two tasks: word recognition and reading aloud. During both tasks, words and non-words were presented side by side, and the subjects were required to press a button corresponding to the real word in the word recognition task and were required to read aloud the real word in the reading aloud task. Brain activations were similar between kanji and kana during reading aloud task, whereas during word recognition task in which accurate identification and selection were required, kanji relative to kana activated regions of bilateral frontal, parietal and occipitotemporal cortices, all of which were related mainly to visual word-form analysis and visuospatial attention. Concerning the difference of brain activity between two tasks, differential activation was found only in the regions associated with task-specific sensorimotor processing for kana, whereas visuospatial attention network also showed greater activation during word recognition task than during reading aloud task for kanji. We conclude that the differences in brain activation between kanji and kana depend on the interaction between the script characteristics and the task demands.

[1]  M. Sigman,et al.  The neural code for written words: a proposal , 2005, Trends in Cognitive Sciences.

[2]  C. J. Price,et al.  Cortical localisation of the visual and auditory word form areas: A reconsideration of the evidence , 2003, Brain and Language.

[3]  Manuel Carreiras,et al.  Brain Activation for Lexical Decision and Reading Aloud: Two Sides of the Same Coin? , 2007, Journal of Cognitive Neuroscience.

[4]  S Lehéricy,et al.  The visual word form area: spatial and temporal characterization of an initial stage of reading in normal subjects and posterior split-brain patients. , 2000, Brain : a journal of neurology.

[5]  Makoto Iwata,et al.  Kanji versus Kananeuropsychological correlates of the Japanese writing system , 1984, Trends in Neurosciences.

[6]  Y. Sakurai,et al.  Fusiform type alexia: Pure alexia for words in contrast to posterior occipital type pure alexia for letters , 2006, Journal of the Neurological Sciences.

[7]  I. Kanazawa,et al.  Different cortical activity in reading of Kanji words, Kana words and Kana nonwords. , 2000, Brain research. Cognitive brain research.

[8]  Bruce D. McCandliss,et al.  The visual word form area: expertise for reading in the fusiform gyrus , 2003, Trends in Cognitive Sciences.

[9]  C. J. Moore,et al.  How reading differs from object naming at the neuronal level , 2006, NeuroImage.

[10]  Christian Gerlach,et al.  The Visual What For Area: Words and pictures in the left fusiform gyrus , 2007, NeuroImage.

[11]  R. Zatorre,et al.  Voice-selective areas in human auditory cortex , 2000, Nature.

[12]  M. Sugishita,et al.  A critical appraisal of neuropsychological correlates of Japanese ideogram (kanji) and phonogram (kana) reading. , 1992, Brain : a journal of neurology.

[13]  G Jobard,et al.  Evaluation of the dual route theory of reading: a metanalysis of 35 neuroimaging studies , 2003, NeuroImage.

[14]  S. Sasanuma,et al.  The nature of the task-stimulus interaction in the tachistoscopic recognition of kana and kanji words , 1980, Brain and Language.

[15]  A Kawakami,et al.  Differential Cognitive Processing of Kanji and Kana Words: Do Orthographic and Semantic Codes Function in Parallel in Word Matching Task , 2001, Perceptual and motor skills.

[16]  D. Gitelman,et al.  Covert Visual Spatial Orienting and Saccades: Overlapping Neural Systems , 2000, NeuroImage.

[17]  M. D’Esposito,et al.  Functional MRI studies of spatial and nonspatial working memory. , 1998, Brain research. Cognitive brain research.

[18]  Takashi Hanakawa,et al.  Modulation of the Visual Word Retrieval System in Writing: A Functional MRI Study on the Japanese Orthographies , 2002, Journal of Cognitive Neuroscience.

[19]  Guinevere F. Eden,et al.  Meta-Analysis of the Functional Neuroanatomy of Single-Word Reading: Method and Validation , 2002, NeuroImage.

[20]  R. C. Oldfield.  The assessment and analysis of handedness: the Edinburgh inventory. , 1971, Neuropsychologia.

[21]  Hidenao Fukuyama,et al.  Longitudinal fMRI study of reading in a patient with letter-by-letter reading , 2008, Cortex.

[22]  Paul W. B. Atkins,et al.  Models of reading aloud: Dual-route and parallel-distributed-processing approaches. , 1993 .

[23]  S. Dehaene,et al.  Language-specific tuning of visual cortex? Functional properties of the Visual Word Form Area. , 2002, Brain : a journal of neurology.

[24]  Paul A. Newhouse,et al.  The Stroop effect in kana and kanji scripts in native Japanese speakers: An fMRI study , 2008, Brain and Language.

[25]  T. Ortiz,et al.  Do different writing systems involve distinct profiles of brain activation? A magnetoencephalography study , 2003, Journal of Neurolinguistics.

[26]  T. Hatta.  Recognition of Japanese kanji in the left and right visual fields , 1977, Neuropsychologia.

[27]  A. Nobre,et al.  The Large-Scale Neural Network for Spatial Attention Displays Multifunctional Overlap But Differential Asymmetry , 1999, NeuroImage.

[28]  Richard S. J. Frackowiak,et al.  Functional localization of the system for visuospatial attention using positron emission tomography. , 1997, Brain : a journal of neurology.

[29]  Hidenao Fukuyama,et al.  Processing of Japanese morphogram and syllabogram in the left basal temporal area: electrical cortical stimulation studies. , 2005, Brain research. Cognitive brain research.

[30]  Sumiko Sasanuma,et al.  Tachistoscopic recognition of kana and kanji words , 1977, Neuropsychologia.

[31]  Sachiko Koyama,et al.  Reading of Japanese Kanji (morphograms) and Kana (syllabograms): a magnetoencephalographic study , 1998, Neuropsychologia.

[32]  B. Wandell,et al.  Differential sensitivity to words and shapes in ventral occipito-temporal cortex. , 2007, Cerebral cortex.

[33]  Joel R. Meyer,et al.  A large-scale distributed network for covert spatial attention: further anatomical delineation based on stringent behavioural and cognitive controls. , 1999, Brain : a journal of neurology.

[34]  M. Honda,et al.  Participation of the left posterior inferior temporal cortex in writing and mental recall of kanji orthography: A functional MRI study. , 2000, Brain : a journal of neurology.

[35]  Joseph T Devlin,et al.  The myth of the visual word form area , 2003, NeuroImage.

[36]  S. Dehaene,et al.  The visual word form area: a prelexical representation of visual words in the fusiform gyrus , 2002, Neuroreport.

[37]  Stanislas Dehaene,et al.  Subliminal Convergence of Kanji and Kana Words: Further Evidence for Functional Parcellation of the Posterior Temporal Cortex in Visual Word Perception , 2005, Journal of Cognitive Neuroscience.

[38]  Mariano Sigman,et al.  Hierarchical Coding of Letter Strings in the Ventral Stream: Dissecting the Inner Organization of the Visual Word-Form System , 2007, Neuron.

[39]  Hidenao Fukuyama,et al.  Implicit and explicit processing of kanji and kana words and non-words studied with fMRI , 2004, NeuroImage.

[40]  Stanislas Dehaene,et al.  Specialization within the ventral stream: the case for the visual word form area , 2004, NeuroImage.