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Investigating the effects of handedness on the consistency of lateralization for speech production and semantic processing tasks using functional transcranial Doppler sonography
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Testing the unitary theory of language lateralization using functional transcranial Doppler sonography in adults
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Abstract:
Hemispheric dominance for language can vary from task to task, but it is unclear if this reflects error of measurement or independent lateralization of different language systems. We used functional transcranial Doppler sonography to assess language lateralization within the middle cerebral artery territory in 37 adults (seven left-handers) on six tasks, each given on two occasions. Tasks taxed different aspects of language function. A pre-registered structural equation analysis was used to compare models of means and covariances. For most people, a single lateralized factor explained most of the covariance between tasks. A minority, however, showed dissociation of asymmetry, giving a second factor. This was mostly derived from a receptive task, which was highly reliable but not lateralized. The results suggest that variation in the strength of language lateralization reflects true individual differences and not just error of measurement. The inclusion of several tasks in a laterality battery makes it easier to detect cases of atypical asymmetry.
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URL: https://doi.org/10.1098/rsos.181801 http://wrap.warwick.ac.uk/160084/
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CATALISE : a multinational and multidisciplinary Delphi consensus study. Identifying language impairments in children
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CATALISE : a multinational and multidisciplinary Delphi consensus study. Identifying language impairments in children
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Increased prevalence of sex chromosome aneuploidies in specific language impairment and dyslexia
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CNTNAP2 variants affect early language development in the general population
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Overlaps between autism and language impairment: phenomimicry or shared etiology?
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Lower-frequency event-related desynchronization: a signature of late mismatch responses to sounds, which is reduced or absent in children with specific language impairment
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Genes, cognition, and communication: insights from neurodevelopmental disorders
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Weak hand preference in children with down syndrome is associated with language deficits
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Weak hand preference in children with Down syndrome is associated with language deficits
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Heritability of specific language impairment depends on diagnostic criteria
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Heritable risk factors associated with language impairments
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Is poor frequency modulation detection linked to literacy problems? A comparison of specific reading disability and mild to moderate sensorineural hearing loss
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Speech and non-speech processing in people with specific language impairment: a behavioural and electrophysiological study
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Frequency discrimination deficits in people with specific language impairment : reliability, validity, and linguistic correlates
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