Sex differences in the development of neuroanatomical functional connectivity underlying intelligence found using
Vincent J Schmithorst1, Scott K Holland
1Pediatric Brain Imaging Research Program, Imaging Research Center, Department of Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA. Vince.Schmithorst@cchmc.org <Vince.Schmithorst@cchmc.org>
Neuroimage
|January 16, 2007
Summary
This study reveals sex differences in how children’s intelligence relates to brain connectivity during narrative comprehension. Boys show stronger links between intelligence and Broca
Area of Science:
- Neuroscience
- Developmental Psychology
- Cognitive Science
Background:
- Understanding the neural basis of intelligence in children is crucial for developmental research.
- Investigating sex differences in brain function can reveal distinct developmental trajectories.
- Functional connectivity analysis provides insights into brain network organization.
Purpose of the Study:
- To investigate sex-based differences in the relationship between intelligence and functional brain connectivity in children.
- To explore the neural correlates of intelligence during narrative comprehension in boys and girls.
- To examine developmental effects on functional connectivity related to intelligence.
Main Methods:
- A Bayesian method for functional connectivity analysis was adapted for between-group comparisons.
- The study included a cohort of nearly 300 children.
- Analysis focused on functional connectivity during a narrative comprehension task.
Main Results:
- Boys exhibited a stronger association between intelligence and connectivity between Broca's area and auditory regions (Wernicke's areas, right posterior superior temporal gyrus).
- Girls showed a greater association between intelligence and connectivity linking the left posterior superior temporal gyrus to bilateral Wernicke's areas.
- A developmental effect was observed in girls, with increasing age positively correlating with intelligence-related connectivity in specific pathways.
Conclusions:
- The findings demonstrate a significant sexual dimorphism in the relationship between functional connectivity and intelligence in children.
- Girls show an age-dependent increase in reliance on inter-hemispheric connectivity for intelligence.
- These results highlight distinct neural pathways supporting cognitive functions in developing boys and girls.
Related Concept Videos
01:30Biological Influences on Intelligence
Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more...
01:29Environmental Influences on Intelligence
Despite the strong genetic influence on traits like intelligence, environmental factors significantly shape outcomes. For example, while over 90% of height variation is due to genetic differences, environmental factors such as nutrition also have a notable impact. Similarly, for intelligence, changes in a child's surroundings can significantly alter their IQ. Research shows that enriched environments boost children's academic success and help them develop key cognitive skills. Children from...
01:25Cattell's Theory of Intelligence
Raymond Cattell, along with John Horn, made significant contributions to our understanding of intelligence by distinguishing between two types: fluid intelligence and crystallized intelligence.
Fluid intelligence involves the capacity to solve new problems and adapt to unfamiliar situations. It's the type of intelligence individuals use when they encounter a novel problem or puzzle that requires innovative thinking. For instance, figuring out how to operate a new gadget relies heavily on fluid...
Fluid intelligence involves the capacity to solve new problems and adapt to unfamiliar situations. It's the type of intelligence individuals use when they encounter a novel problem or puzzle that requires innovative thinking. For instance, figuring out how to operate a new gadget relies heavily on fluid...