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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.

Original publication




Journal article


Brain Lang

Publication Date





61 - 65


Adult, Blood Flow Velocity, Cerebral Cortex, Cerebrovascular Circulation, Dyslexia, Female, Functional Laterality, Humans, Language Tests, Male, Psychomotor Performance, Ultrasonography, Doppler, Transcranial, Verbal Behavior, Visual Perception, Vocabulary