Hemispheric speech lateralisation in the developing brain is related to motor praxis ability

Hodgson, Jessica and Hirst, Rebecca and Hudson, John (2016) Hemispheric speech lateralisation in the developing brain is related to motor praxis ability. Developmental Cognitive Neuroscience, 22 . pp. 9-17. ISSN 1878-9293

Full content URL: http://dx.doi.org/10.1016/j.dcn.2016.09.005

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Item Type:Article
Item Status:Live Archive


Commonly displayed functional asymmetries such as hand dominance and hemispheric
speech lateralisation are well researched in adults. However there is debate about when such
functions become lateralised in the typically developing brain. This study examined whether
patterns of speech laterality and hand dominance were related and whether they varied with
age in typically developing children. 148 children aged 3-10 years performed an electronic
pegboard task to determine hand dominance; a subset of 38 of these children also underwent
functional Transcranial Doppler (fTCD) imaging to derive a lateralisation index (LI) for
hemispheric activation during speech production using an animation description paradigm.
There was no main effect of age in the speech laterality scores, however, younger children
showed a greater difference in performance between their hands on the motor task.
Furthermore, this between-hand performance difference significantly interacted with direction
of speech laterality, with a smaller between-hand difference relating to increased left
hemisphere activation. This data shows that both handedness and speech lateralisation appear
relatively determined by age 3, but that atypical cerebral lateralisation is linked to greater
performance differences in hand skill, irrespective of age. Results are discussed in terms of the
common neural systems underpinning handedness and speech lateralisation.

Keywords:Speech Production, Lateralization, Transcranial Doppler, Motor control, Development, JCOpen
Subjects:B Subjects allied to Medicine > B140 Neuroscience
C Biological Sciences > C820 Developmental Psychology
C Biological Sciences > C860 Neuropsychology
Divisions:College of Social Science > School of Psychology
ID Code:24648
Deposited On:12 Oct 2016 14:38

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