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Evidence of altered dominance in children with congenital spastic hemiplegia
1Department of Pediatric Neurology, Helsinki University, Children's Castle Hospital, Finland.
Insights
Congenital lateralized brain damage can alter language and visual function dominance in children. Despite variability in neural adjustment, tests accurately identified damage lateralization in 91.3% of cases.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatric Neurology
Background:
- Congenital lateralized brain damage can impact cognitive functions.
- Understanding hemispheric specialization and neural plasticity is crucial in pediatric cases.
Purpose of the Study:
- To investigate lateralization effects and neural adjustment in children with congenital lateralized brain damage.
- To assess the utility of dichotic listening and chimeric tests in identifying brain damage lateralization.
Main Methods:
- Utilized dichotic listening, chimeric, and neuropsychological tests.
- Assessed 33 children with spastic hemiplegia and 86 controls (ages 5-12).
- Analyzed data based on left- and right-hemisphere damage groups.
Main Results:
- Children with left-hemisphere damage showed pathological left-ear advantage for verbal tasks.
- Children with right-hemisphere damage exhibited pathological right visual half-field advantage for visual tasks.
- A significant proportion of children with left-hemisphere damage displayed reversed dominance signs on chimeric testing.
Conclusions:
- Lateralized brain damage can alter functional dominance, but significant individual variability in neural adjustment exists.
- Dichotic and chimeric tests showed high accuracy (91.3%) in lateralizing known brain damage.
- These tests are valuable tools for assessing lateralization in pediatric neurological conditions.
Abstract:
The study aimed at investigating lateralization effects and signs of transfer and crowding in children with congenital lateralized brain damage with the aid of a dichotic listening test, a chimeric test, and verbal and nonverbal neuropsychological tests. Thirty-three children with spastic hemiplegia and 86 control children (age 5.0-12.0 yr) were assessed. Children with left-hemisphere damage (n = 17) were found to have a pathological left-ear advantage for verbal material, and children with right-hemisphere damage (n = 16) were found to have a pathological right visual half-field advantage for visual material. Children with left-hemisphere damage and a left-ear advantage on the dichotic test were also found to have a right visual half-field advantage on the chimeric test, which was regarded as a sign of reversed dominance. No verbal or nonverbal differences emerged between the left-hemisphere and the right-hemisphere damage groups, nor did differences emerge when the children were reclassified by considering children with left hemisphere damage and signs of reversed dominance as having damage to the nondominant hemisphere. It was concluded that although lateralized brain damage may alter the dominance for verbal and visual functions, there is still considerable inter-individual variability with respect to inter- and intrahemispheric neural adjustment to damage. The dichotic and the chimeric tests did not indicate the presence of brain damage accurately, but they indicated the lateralization of damage in children with stated abnormality with a high degree (91.3%) of accuracy.