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Hemispheric asymmetry in the processing of Japanese script.

Kevin Hanavan1, Jeffrey Coney

  • 1Murdoch University, Western Australia, Australia.

Laterality
|September 30, 2005
PubMed
Summary

Japanese writing uses logographic (kanji) and phonetic (kana) scripts. This study found kana processing shows a right visual field advantage, while kanji shows a left visual field advantage, impacting lexical access differently.

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Area of Science:

  • Cognitive Neuroscience
  • Psycholinguistics
  • Neuroscience of Language

Background:

  • Japanese written language integrates logographic (kanji) and phonetic (kana) scripts.
  • Previous research indicates differing patterns of hemispheric asymmetry for kanji and kana encoding.
  • The impact of orthographic encoding asymmetries on lexical access remains an area for investigation.

Purpose of the Study:

  • To investigate how hemispheric differences in orthographic encoding influence lexical access.
  • To compare the visual field advantages for processing Japanese kana and kanji scripts.
  • To explore the temporal dynamics of priming effects for logographic and phonetic scripts.

Main Methods:

  • A lexical decision task was employed within an associative priming paradigm.
  • Thirty-two participants processed both kanji and kana stimuli.
  • Visual field advantages and priming effects were analyzed for each script.

Main Results:

  • A right visual field advantage was observed for kana processing.
  • No significant lateralized advantage was found for kanji stimuli.
  • Kanji stimuli exhibited a late-developing, stronger priming effect in the left visual field.

Conclusions:

  • Hemispheric asymmetry in orthographic encoding differentially impacts lexical access for kana and kanji.
  • Kana processing is associated with right visual field advantage, suggesting distinct neural pathways.
  • The findings support models like recognition-with-phonology for logographic script processing, highlighting script-specific cognitive mechanisms.

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