Left hemiparalexia of Chinese characters: Neglect dyslexia or disruption of pathway of visual word form processing?

Wenchao Yi, Ting Wu, Wei Chen, Ti Fei Yuan, Benyan Luo, Chunlei Shan, Jianan Li, Sheng He, Xuchu Weng

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The objective of the study was to further elucidate the potential mechanisms underlying left hemiparalexia induced by a splenium lesion in corpus callosum. A patient KY, who had infarctions in the splenium and the left ventral medial occipitotemporal area, was examined with neuropsychological tests and fMRI. KY presented left hemiparalexia when he read aloud characters presented in central foveal field tachistoscopically as well as in free-view field. KY also showed left hemialexia for characters in left visual field, while no left hemiparalexia occurred when characters were presented in the right visual field. KY performed poorly in lexical decision tasks. He could judge the directions of Landolt's rings gaps in the left or right visual field equally. The result of fMRI indicated that characters in the left visual field could not activate the visual word form area (VWFA), such as left mid-fusiform cortex. All the above neuropsychological and fMRI findings have provided evidences against the assumption of left hemineglect dyslexia. Instead, they support the mechanism of disconnection of visual word form processing pathway. In conclusion, the evidences suggested that the visual information transmission of characters in the left visual field from right occipital area to the VWFA in the left hemisphere was interrupted by the splenium lesion.

Original languageEnglish (US)
Pages (from-to)283-292
Number of pages10
JournalBrain Structure and Function
Volume219
Issue number1
DOIs
StatePublished - Jan 2014

Keywords

  • FMRI
  • Hemineglect dyslexia
  • Left hemialexia
  • Left hemiparalexia
  • Splenium of corpus callosum
  • Visual word form area (VWFA)

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