Effect of Word and Syllable Frequency on Activation During Lexical Decision and Reading Aloud

Carreiras, Manuel; Mechelli, Andrea; Price, Cathy J

doi:10.1002/hbm.20236

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Effect of Word and Syllable Frequency on Activation During Lexical Decision and Reading Aloud

Published Date:

Dec 2006

Publisher's site:

http://dx.doi.org/10.1002/hbm.20236 New Site Icon

Source:

Hum Brain Mapp. 2006; 27(12):963-972.

[PDF - 240.45 KB]

Details:

Personal Authors:

Carreiras, Manuel ; Mechelli, Andrea ; Price, Cathy J ;

Keywords:

[+]

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.

Document Type:

Journal Article

Collection(s):

CDC Public Access

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

Supporting Files:

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license.txt	text/plain

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