Distinct role of spatial frequency in dissociative reading of ideograms and phonograms: An fMRI study

Shizuka Horie, Takao Yamasaki, Tsuyoshi Okamoto, Shigeyuki Kan, Katsuya Ogata, Satoru Miyauchi, Shozo Tobimatsu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

It has been proposed that distinct neural circuits are activated by reading Japanese ideograms (Kanji) and phonograms (Kana). By measuring high-density event-related potentials, we recently reported that spatial frequency (SF) information is responsible for the dissociation between Kanji and Kana reading. In particular, we found close links between Kana and low SF (LSF) information and between Kanji and high SF (HSF) information. However, it remains unclear which brain regions contribute to this dissociation. To determine this, we performed functional magnetic resonance imaging while presenting unfiltered or spatially filtered Kanji and Kana word stimuli to healthy native Japanese subjects. Fourier analysis revealed that Kanji and Kana stimuli were characterized by HSF and LSF information, respectively. When presented with either type of unfiltered stimulus (Kanji or Kana), the bilateral inferior temporal (IT, BA 37) regions were activated compared to the resting condition. Kana but not Kanji reading also activated the bilateral inferior parietal lobules (IPL, BA 40). When we compared Kanji and Kana reading directly, the left IT region was significantly activated by Kanji reading, while significant activation of the left IPL was observed during Kana reading. In response to filtered HSF stimuli, the Kanji reading minus Kana reading comparison revealed significant activation of the left IT region but not the left IPL. Conversely, significant activation of the left IPL but not the left IT region occurred in the Kana reading minus Kanji reading comparison for filtered LSF stimuli. These results suggest that Kanji and Kana engage a relatively overlapping network, within which the left IT is more involved in Kanji processing, while the left IPL contributes more to Kana processing. The preferential engagements of these brain regions could reflect the close links between Kana and LSF information, and between Kanji and HSF information. Therefore, this study provides further evidence that SF contributes to the dissociation between Kanji and Kana reading.

Original languageEnglish
Pages (from-to)979-988
Number of pages10
JournalNeuroImage
Volume63
Issue number2
DOIs
Publication statusPublished - Nov 1 2012

Fingerprint

Reading
Magnetic Resonance Imaging
Parietal Lobe
Brain
Fourier Analysis
Population Groups
Evoked Potentials

All Science Journal Classification (ASJC) codes

  • Neurology
  • Cognitive Neuroscience

Cite this

Distinct role of spatial frequency in dissociative reading of ideograms and phonograms : An fMRI study. / Horie, Shizuka; Yamasaki, Takao; Okamoto, Tsuyoshi; Kan, Shigeyuki; Ogata, Katsuya; Miyauchi, Satoru; Tobimatsu, Shozo.

In: NeuroImage, Vol. 63, No. 2, 01.11.2012, p. 979-988.

Research output: Contribution to journalArticle

Horie, Shizuka ; Yamasaki, Takao ; Okamoto, Tsuyoshi ; Kan, Shigeyuki ; Ogata, Katsuya ; Miyauchi, Satoru ; Tobimatsu, Shozo. / Distinct role of spatial frequency in dissociative reading of ideograms and phonograms : An fMRI study. In: NeuroImage. 2012 ; Vol. 63, No. 2. pp. 979-988.
@article{b9c79533d0e14fc9864687e3144c30a9,
title = "Distinct role of spatial frequency in dissociative reading of ideograms and phonograms: An fMRI study",
abstract = "It has been proposed that distinct neural circuits are activated by reading Japanese ideograms (Kanji) and phonograms (Kana). By measuring high-density event-related potentials, we recently reported that spatial frequency (SF) information is responsible for the dissociation between Kanji and Kana reading. In particular, we found close links between Kana and low SF (LSF) information and between Kanji and high SF (HSF) information. However, it remains unclear which brain regions contribute to this dissociation. To determine this, we performed functional magnetic resonance imaging while presenting unfiltered or spatially filtered Kanji and Kana word stimuli to healthy native Japanese subjects. Fourier analysis revealed that Kanji and Kana stimuli were characterized by HSF and LSF information, respectively. When presented with either type of unfiltered stimulus (Kanji or Kana), the bilateral inferior temporal (IT, BA 37) regions were activated compared to the resting condition. Kana but not Kanji reading also activated the bilateral inferior parietal lobules (IPL, BA 40). When we compared Kanji and Kana reading directly, the left IT region was significantly activated by Kanji reading, while significant activation of the left IPL was observed during Kana reading. In response to filtered HSF stimuli, the Kanji reading minus Kana reading comparison revealed significant activation of the left IT region but not the left IPL. Conversely, significant activation of the left IPL but not the left IT region occurred in the Kana reading minus Kanji reading comparison for filtered LSF stimuli. These results suggest that Kanji and Kana engage a relatively overlapping network, within which the left IT is more involved in Kanji processing, while the left IPL contributes more to Kana processing. The preferential engagements of these brain regions could reflect the close links between Kana and LSF information, and between Kanji and HSF information. Therefore, this study provides further evidence that SF contributes to the dissociation between Kanji and Kana reading.",
author = "Shizuka Horie and Takao Yamasaki and Tsuyoshi Okamoto and Shigeyuki Kan and Katsuya Ogata and Satoru Miyauchi and Shozo Tobimatsu",
year = "2012",
month = "11",
day = "1",
doi = "10.1016/j.neuroimage.2012.03.046",
language = "English",
volume = "63",
pages = "979--988",
journal = "NeuroImage",
issn = "1053-8119",
publisher = "Academic Press Inc.",
number = "2",

}

TY - JOUR

T1 - Distinct role of spatial frequency in dissociative reading of ideograms and phonograms

T2 - An fMRI study

AU - Horie, Shizuka

AU - Yamasaki, Takao

AU - Okamoto, Tsuyoshi

AU - Kan, Shigeyuki

AU - Ogata, Katsuya

AU - Miyauchi, Satoru

AU - Tobimatsu, Shozo

PY - 2012/11/1

Y1 - 2012/11/1

N2 - It has been proposed that distinct neural circuits are activated by reading Japanese ideograms (Kanji) and phonograms (Kana). By measuring high-density event-related potentials, we recently reported that spatial frequency (SF) information is responsible for the dissociation between Kanji and Kana reading. In particular, we found close links between Kana and low SF (LSF) information and between Kanji and high SF (HSF) information. However, it remains unclear which brain regions contribute to this dissociation. To determine this, we performed functional magnetic resonance imaging while presenting unfiltered or spatially filtered Kanji and Kana word stimuli to healthy native Japanese subjects. Fourier analysis revealed that Kanji and Kana stimuli were characterized by HSF and LSF information, respectively. When presented with either type of unfiltered stimulus (Kanji or Kana), the bilateral inferior temporal (IT, BA 37) regions were activated compared to the resting condition. Kana but not Kanji reading also activated the bilateral inferior parietal lobules (IPL, BA 40). When we compared Kanji and Kana reading directly, the left IT region was significantly activated by Kanji reading, while significant activation of the left IPL was observed during Kana reading. In response to filtered HSF stimuli, the Kanji reading minus Kana reading comparison revealed significant activation of the left IT region but not the left IPL. Conversely, significant activation of the left IPL but not the left IT region occurred in the Kana reading minus Kanji reading comparison for filtered LSF stimuli. These results suggest that Kanji and Kana engage a relatively overlapping network, within which the left IT is more involved in Kanji processing, while the left IPL contributes more to Kana processing. The preferential engagements of these brain regions could reflect the close links between Kana and LSF information, and between Kanji and HSF information. Therefore, this study provides further evidence that SF contributes to the dissociation between Kanji and Kana reading.

AB - It has been proposed that distinct neural circuits are activated by reading Japanese ideograms (Kanji) and phonograms (Kana). By measuring high-density event-related potentials, we recently reported that spatial frequency (SF) information is responsible for the dissociation between Kanji and Kana reading. In particular, we found close links between Kana and low SF (LSF) information and between Kanji and high SF (HSF) information. However, it remains unclear which brain regions contribute to this dissociation. To determine this, we performed functional magnetic resonance imaging while presenting unfiltered or spatially filtered Kanji and Kana word stimuli to healthy native Japanese subjects. Fourier analysis revealed that Kanji and Kana stimuli were characterized by HSF and LSF information, respectively. When presented with either type of unfiltered stimulus (Kanji or Kana), the bilateral inferior temporal (IT, BA 37) regions were activated compared to the resting condition. Kana but not Kanji reading also activated the bilateral inferior parietal lobules (IPL, BA 40). When we compared Kanji and Kana reading directly, the left IT region was significantly activated by Kanji reading, while significant activation of the left IPL was observed during Kana reading. In response to filtered HSF stimuli, the Kanji reading minus Kana reading comparison revealed significant activation of the left IT region but not the left IPL. Conversely, significant activation of the left IPL but not the left IT region occurred in the Kana reading minus Kanji reading comparison for filtered LSF stimuli. These results suggest that Kanji and Kana engage a relatively overlapping network, within which the left IT is more involved in Kanji processing, while the left IPL contributes more to Kana processing. The preferential engagements of these brain regions could reflect the close links between Kana and LSF information, and between Kanji and HSF information. Therefore, this study provides further evidence that SF contributes to the dissociation between Kanji and Kana reading.

UR - http://www.scopus.com/inward/record.url?scp=84866170427&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84866170427&partnerID=8YFLogxK

U2 - 10.1016/j.neuroimage.2012.03.046

DO - 10.1016/j.neuroimage.2012.03.046

M3 - Article

C2 - 22480729

AN - SCOPUS:84866170427

VL - 63

SP - 979

EP - 988

JO - NeuroImage

JF - NeuroImage

SN - 1053-8119

IS - 2

ER -