کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
930166 1474412 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhancement of brain event-related potentials to speech sounds is associated with compensated reading skills in dyslexic children with familial risk for dyslexia
ترجمه فارسی عنوان
تقویت پتانسیل مربوط به رویداد مغز به صداهای گفتاری با مهارتهای خواندن جبران شده در کودکان نارساخوانی با خطر خانوادگی برای نارساخوانی همراه است
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب رفتاری
چکیده انگلیسی


• We studied speech processing of dyslexic children with familial risk for dyslexia.
• ERPs to stimuli varying in consonant duration were obtained.
• We found enhanced responses to shortening of phoneme duration in dyslexic children.
• Enhancement was linked to better discrimination and reading/writing accuracy.
• This indicates a compensatory mechanism in a sub-group of children with dyslexia.

Specific reading disability, dyslexia, is a prevalent and heritable disorder impairing reading acquisition characterized by a phonological deficit. However, the underlying mechanism of how the impaired phonological processing mediates resulting dyslexia or reading disabilities remains still unclear. Using ERPs we studied speech sound processing of 30 dyslexic children with familial risk for dyslexia, 51 typically reading children with familial risk for dyslexia, and 58 typically reading control children. We found enhanced brain responses to shortening of a phonemic length in pseudo-words (/at:a/ vs. /ata/) in dyslexic children with familial risk as compared to other groups. The enhanced brain responses were associated with better performance in behavioral phonemic length discrimination task, as well as with better reading and writing accuracy. Source analyses revealed that the brain responses of sub-group of dyslexic children with largest responses originated from a more posterior area of the right temporal cortex as compared to the responses of the other participants. This is the first electrophysiological evidence for a possible compensatory speech perception mechanism in dyslexia. The best readers within the dyslexic group have probably developed alternative strategies which employ compensatory mechanisms substituting their possible earlier deficit in phonological processing and might therefore be able to perform better in phonemic length discrimination and reading and writing accuracy tasks. However, we speculate that for reading fluency compensatory mechanisms are not that easily built and dyslexic children remain slow readers during their adult life.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Psychophysiology - Volume 94, Issue 3, December 2014, Pages 298–310
نویسندگان
, , , , , , ,