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Yıl:2015; Cilt: 2; Sayı: 2>> Özet
TAM METİN
The Journal of Neurobehavioral Sciences; 2015;2(2):64-71
Gelişimsel Diskalkuli Sahibi Yetişkinlerde Nöral Bağlantıların fMRI ile İncelenmesi
S Şahin
Ahi Evran Üniversitesi, Kırşehir
Gelişimsel diskalkuli matematik yeteneğini etkileyen bir özel öğrenme güçlüğü formudur. Bu bozukluğa neden olan faktörler kesin olarak bilinememektedir. Son çalışmalar, diskalkulinin ortaya çıkmasında beyindeki spesifik bölgelerin etkili olabileceği yönünde kanıt ortaya koymaktadır. Bu beyin bölgeleri arasında; intraparyetal oluk, angular girus ve supramarjinal girus yer almaktadır. Bu çalışma, bu bölgelerin gelişimsel diskalkulideki rollerini araştırmaktadır. Çalışmaya 10 gelişimsel diskalkuli sahibi yetişkin, 10 da kontrol grubu olmak üzere 20 katılımcı dahil olmuştur. Katılımcılar sayı kıyaslama, toplama ve çıkarma işlemlerini yaparken fMRI ile beyin aktiviteleri görüntülenmiştir. Sayı kıyaslama esnasında intraparyetal olukta beyin aktivasyonu tespit edilmiştir. Toplama-çıkarma esnasında intraparyetal oluk, angular girus ve supramarjinal girusda beyin aktivasyonu tespit edilmiştir. Sayı kıyaslama esnasında IPS de gözlenen aktivasyon diskalkulik grupla kıyaslandığında kontrol grubunda daha az saptanmamıştır. Ayrıca, toplama- çıkarma esnasında da ANG, SMG ve IPS’de de aktivasyon gözlenmiştir.
An Investigation of Neural Correlates in Adults with Developmental Dyscalculia Using fMRI
Developmental dyscalculia is a specific learning difficulty which reflects deficits in arithmetical skills. The cause behind this disorder is not known. Recent studies provide evidence in favor of believing that the disorder is somehow tied with specific brain regions’ roles. These regions include the intraparietal sulcus (IPS), the angular gyrus (ANG) and the supramarginal gyrus (SMG) in developmental dyscalculia. The present study investigates the role of these regions in adults with developmental dyscalculia. Brain images were collected from 10 participants with developmental dyscalculia and 10 control participants using fMRI while conducting number comparison, multiplication and subtraction tasks. The results revealed the activation of the intraparietal sulcus during number comparison and the activation of both the angular gyrus, the supramarginal gyrus, and the intraparietal sulcus during calculation tasks. These results suggest that the IPS activation was not less than the developmental dyscalculia group than in the control group when conducting the number comparison task; and that there were activation in the ANG, SMG and IPS regions of the brain in participants’ brains during both the multiplication and subtraction tasks.

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