Atypical cerebral lateralisation in adults with compensated developmental dyslexia demonstrated using functional transcranial Doppler ultrasound |
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Authors: | Sarah Illingworth Dorothy V.M. Bishop |
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Affiliation: | aUniversity of Oxford, Department of Experimental Psychology, South Parks Road, OX1 3UD, United Kingdom |
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Abstract: | Functional transcranial Doppler ultrasound (fTCD) is a relatively new and non-invasive technique that assesses cerebral lateralisation through measurements of blood flow velocity in the middle cerebral arteries. In this study fTCD was used to compare functional asymmetry during a word generation task between a group of 30 dyslexic adults and a group of 30 non-dyslexic individuals. In light of previous evidence of atypical laterality in dyslexia, a reduced leftward asymmetry was predicted and confirmed. We know from previous research that most people with atypical language lateralisation have normal language and literacy skills: nevertheless, our results confirm that language laterality is reduced in those with dyslexia. Theoretical explanations for this apparent conundrum are discussed. |
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Keywords: | Cerebral lateralisation Dyslexia Functional transcranial Doppler ultrasound |
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