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Exploring Cognitive Functions in Babies, Children & Adults with Near Infrared Spectroscopy
Published on: July 28, 2009
Working memory function in Chinese dyslexic children: a near-infrared spectroscopy study
Dongmei Zhu1,2, Jing Wang3, Hanrong Wu4
1Department of Child and Woman Health Care, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
Summary
Chinese children with dyslexia show lower working memory capacity and reduced left prefrontal cortex activation compared to controls. This suggests brain function deficits may underlie dyslexia, regardless of language.
Area of Science:
- Neuroscience
- Developmental Psychology
- Cognitive Science
Background:
- Dyslexia theories are contradictory, with cross-cultural studies examining cognitive profiles versus language-specific factors.
- Research is needed to understand the neurobiological underpinnings of dyslexia across different linguistic backgrounds.
Purpose of the Study:
- To investigate cognitive function and brain activation in Chinese dyslexic children using Near-Infrared Spectroscopy (NIRS).
- To explore the relationship between working memory, left prefrontal cortex activity, and dyslexia in a Chinese population.
Main Methods:
- Near-Infrared Spectroscopy (NIRS) was used to measure regional cerebral blood volume and activation.
- Paced Visual Serial Addition Test (PVSAT) assessed working memory in 12 Chinese dyslexic children and 12 age-matched controls.
Main Results:
- Dyslexic children scored significantly lower on the PVSAT compared to normal controls (t=3.33, P<0.01).
- Significantly greater left prefrontal cortex activation was observed in normal children versus dyslexic children (all P<0.01).
Conclusions:
- Chinese dyslexia is associated with a general working memory deficiency.
- Abnormal brain blood volume metabolic activity in the left prefrontal cortex may cause these deficits, indicating potential neuropathology.
- Findings support the idea that differences in dyslexic brain activation across languages may stem from a common reading-related cognitive system.
