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Cortical effects of shifting letter-position in letter-strings of varying length

Cornelissen, P., Tarkiainen, A., Helenius, P. and Salmelin, R. (2006) Cortical effects of shifting letter-position in letter-strings of varying length. Journal of Cognitive Neuroscience, 15 (5). pp. 731-746. ISSN 0898-929X

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Neuroimaging and lesion studies suggest that occipitotemporal brain areas play a necessary role in recognizing a wide variety of objects, be they faces, letters, numbers, or household items. However, many questions remain regarding the details of exactly what kinds of information are processed by the occipito-temporal cortex. Here, we address this question with respect to reading. Ten healthy adult subjects performed a single word reading task. We used whole-head magnetoencephalography to measure the spatio-temporal dynamics of brain responses, and investigated their sensitivity to: (1) lexicality (defined here as the difference between words and consonant strings), (2) word length, and (3) variation in letter position. Analysis revealed that midline occipital activity around 100 msec, consistent with low-level visual feature analysis, was insensitive to lexicality and variation in letter position, but was slightly affected by string length. Bilateral occipito-temporal activations around 150 msec were insensitive to lexicality and reacted to word length only in the timing (and not strength) of activation. However, vertical shifts in letter position revealed a hemispheric imbalance: The right hemisphere activation increased with the shifts, whereas the opposite pattern was evident in the left hemisphere. The results are discussed in the light of Caramazza and Hillis's (1990) model of early reading.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Psychology (York)
Depositing User: York RAE Import
Date Deposited: 23 Apr 2009 10:34
Last Modified: 23 Apr 2009 10:34
Published Version: http://dx.doi.org/10.1162/jocn.2003.15.5.731
Status: Published
Publisher: Massachusetts Institute of Technology Press
Identification Number: 10.1162/jocn.2003.15.5.731
URI: http://eprints.whiterose.ac.uk/id/eprint/6586

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