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Decomposing the Variance in Reading Comprehension to Reveal the Unique and Common Effects of Language and Decoding
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In: J Vis Exp (2018)
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The Structure of Oral Language and Reading and Their Relation to Comprehension in Kindergarten through Grade 2
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Examining General and Specific Factors in the Dimensionality of Oral Language and Reading in 4th–10th Grades
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| 17 |
Brain Mechanisms for Reading Words and Pseudowords: an Integrated Approach
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Abstract:
The present study tested two predictions of dual-process models of reading: (i) that the brain structures involved in sublexical phonological analysis and those involved in whole-word phonological access during reading are different; and (ii) that reading of meaningful items, by means of the addressed phonology process, is mediated by different brain structures than reading of meaningless letter strings. We obtained brain activation profiles using Magnetic Source Imaging and, in addition, pronunciation latencies during reading of: (i) exception words (primarily involving addressed phonology and having meaning), (ii) pseudohomophones (requiring assembled phonology and having meaning), and (iii) pseudowords (requiring assembled phonology but having no meaning). Reading of meaningful items entailed a high degree of activation of the left posterior middle temporal gyrus (MTGp) and mesial temporal lobe areas, whereas reading the meaningless pseudowords was associated with much reduced activation of these two regions. Reading of all three types of print resulted in activation of the posterior superior temporal gyrus (STGp), inferior parietal and basal temporal areas. In addition, pronunciation speed of exception words correlated significantly with the onset of activity in MTGp but not STGp, whereas the opposite was true for pseudohomophones and pseudowords. These findings are consistent with the existence of two different brain mechanisms that support phonological processing in word reading: one mechanism that subserves assembled phonology and depends on the posterior part of STGp, and a second mechanism that is responsible for pronouncing words with rare print-to-sound correspondences and does not necessarily involve this region but instead appears to depend on MTGp.
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Articles
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URL: https://doi.org/10.1093/cercor/12.3.297
http://cercor.oxfordjournals.org/cgi/content/short/12/3/297
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