Development of "material-specific" hemispheric specialization from beginning to end

Disparity of verbal and performance intelligence (VIQ, PIQ) on the Wechsler scales of intelligence is a conceptually cluttered and empirically weak measure of hemispheric specialization (HS). However, in the context of life span research, it is the only measure that can be exploited meta-analyticall...

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Bibliographic Details
Published in:Laterality (Hove) 2018-07, Vol.23 (4), p.422-440
Main Authors: Gingras, Benjamin, Braun, Claude M. J.
Format: Article
Language:English
Subjects:
Adolescent
Adult
Adults
Age
Age of Onset
Aged
Aged, 80 and over
Aging - physiology
Aging - psychology
Brain - growth & development
Brain - physiopathology
Brain Diseases - physiopathology
Brain Diseases - psychology
Brain lesions
Child
Child, Preschool
Epilepsy
Etiology
Female
Functional Laterality - physiology
Hemispheric specialization
Humans
Infant
Infant, Newborn
intelligence
Intelligence - physiology
Intelligence tests
life span
Male
material specific
Middle Aged
Neuropsychological Tests
Prenatal care
Senescence
Specialization
Temporal lobes
unilateral lesion
Young Adult
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Summary:Disparity of verbal and performance intelligence (VIQ, PIQ) on the Wechsler scales of intelligence is a conceptually cluttered and empirically weak measure of hemispheric specialization (HS). However, in the context of life span research, it is the only measure that can be exploited meta-analytically with the lesion method from prenatal life to late senescence. We assembled 1917 cases with a unilateral cortical focal brain lesion occurring at all ages and a post-lesion VIQ and PIQ. Lesion locus, volume and side were documented for each case, as well as age at lesion onset, age at first symptoms and age at the IQ test, presence/absence of epilepsy, lesion aetiology, gender, date of publication or of transfer of medical file. With and without covariate adjustment, HS was significant across the life span though its pattern changed. HS increased linearly and highly significantly until late senescence. Only in early adulthood did VIQ appear to vacate the right temporal lobe and occupy the left and PIQ vacate the left parietal lobe and occupy the right until late senescence. Biomaturational factors are more important in the ontogeny of material-specific HS over the whole life span than previously established.
ISSN:1357-650X
1464-0678
DOI:10.1080/1357650X.2017.1373780