Details:

Alternative Title:
Hum Brain Mapp
Publisher's site:
http://dx.doi.org/10.1002/hbm.20236
Personal Author:
Carreiras, Manuel ; Mechelli, Andrea ; Price, Cathy J
Carreiras, Manuel ; Mechelli, Andrea ; Price, Cathy J Less -
Description:
This functional MRI (fMRI) study investigated the effect of lexical and syllable frequency on visual word processing during lexical decision and reading aloud. Previous research has shown a dissociation of syllable and word frequency effects in Spanish using behavioral and electrophysiological measures, suggesting that sublexical (syllabic) representations are computed and mediate the firing of lexical candidates. Here, we characterize the neuroanatomical basis of these lexical and sublexical manipulations and their dependence on task. During lexical decision, words with low vs. high lexical frequency increased activation in left frontal, anterior cingulate, supplemental motor area (SMA), and pre-SMA regions; while words with high vs. low syllable frequency increased activation in a left anterior inferior temporal region. In contrast, when the words were read aloud those with low vs. high syllable frequency increased activation in the left anterior insula, with no other significant effects. On the basis of the neuroanatomy, we propose that the contrasting effects of syllable frequency during lexical decision and reading aloud reflect two different cognitive processes in visual word processing. Specifically, words with high-frequency syllables may increase lexical competition in the inferior temporal lobe while facilitating articulatory planning in the left anterior insula.
Subject:
[+]
Adult
Analysis Of Variance
Brain Mapping
Cerebral Cortex
Female
Humans
Image Processing, Computer-Assisted
Language
Magnetic Resonance Imaging
Male
Middle Aged
Pattern Recognition, Visual
Photic Stimulation
Reaction Time
Reading
Speech Perception

Source:
Hum Brain Mapp. 2006; 27(12):963-972.
Document Type:
Journal Article
Funding:
051067/Wellcome Trust/United Kingdom ; BSO2003-01135/Wellcome Trust/United Kingdom ; MN64445/MN/OMHHE CDC HHS/United States ; SEJ2004-07680-C02-02/Wellcome Trust/United Kingdom
051067/Wellcome Trust/United Kingdom ; BSO2003-01135/Wellcome Trust/United Kingdom ; MN64445/MN/OMHHE CDC HHS/United States ; SEJ2004-07680-C02-02/Wellcome Trust/United Kingdom Less -
Collection(s):
CDC Public Access
Main Document Checksum:
[+]
urn:sha256:4c442bd8b08fd8359f5d50ef3999a622f771e43bb7762c6f109ccb0d627c93c0
File Type:

Supporting Files

• 	hbm0027-0963-f1.gif	gif
  	hbm0027-0963-f1.jpg	jpeg
  	hbm0027-0963-f2.gif	gif
  	hbm0027-0963-f2.jpg	jpeg
  	hbm0027-0963.nxml	txt
  	license.txt	txt

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