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CEREBRAL LATERALITY FOR THE GENERATION OF SILENT AND WRITTEN LANGUAGE IN MALE AND FEMALE RIGHT- AND LEFT- HANDERS: A FUNCTIONAL TRANSCRANIAL DOPPLER ULTRASOUND STUDY

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Kondyli D., Stathopoulou D., A. Badcock N., Papadatou-Pastou M.

Acta Neuropsychologica

2017

vol. 15(4)

407-432

The cerebral lateralization of language has attracted great research interest. Nevertheless, the bulk of the work focuses on language production and comprehension; research on cerebral lateralization during writing is limited. The present study assessed cerebral lateralization in 60 participants (mean age = 26.65 years, SD = 6.05, range = 20-44), 30 right-handers (14 men) and 30 left-handers (16 men), during written language production by means of functional transcranial Doppler ultrasonography (fTCD) for the first time. Findings show that left-hemispheric lateralization is observed during silent word production, for both left- and right-handers. However, during written word production, the degree of typical (left) hemispheric lateralization was significantly increased for right-handers, while left-handers presented atypical (right) hemispheric lateralization. Importantly, the difference between silent and written word generation was significantly higher in left- compared to right-handers. No main effect of sex or interactions with sex were observed. Findings suggest that a wider network of right-hemispheric areas is used during writing in left-handers. Thus, the known differences in cerebral lateralization between right- and left-handers are stronger during written language production. However, the relative contribution of language and motor areas needs to be further elucidated.

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1 Acta Neuropsychologica

1 2017

1 A. Badcock N.

1 Kondyli D.

1 Papadatou-Pastou M.

1 Stathopoulou D.

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CEREBRAL LATERALITY FOR THE GENERATION OF SILENT AND WRITTEN LANGUAGE IN MALE AND FEMALE RIGHT- AND LEFT- HANDERS: A FUNCTIONAL TRANSCRANIAL DOPPLER ULTRASOUND STUDY