Dysfunctional neural network of spatial working memory contributes to developmental dyscalculia

Area of Science:

• Neuroscience
• Developmental Psychology
• Cognitive Science

Background:

• Neural mechanisms of developmental dyscalculia (DD) remain unclear, with limited research on cognitive domains like working memory.
• Existing studies suggest a link between DD and spatial working memory, though the exact relationship is debated.
• This study hypothesizes that impaired spatial working memory hinders the development of spatial number representations in children with DD.

Purpose of the Study:

• To compare brain activity during spatial working memory tasks in children with DD and typically developing controls using functional MRI.
• To investigate the neural underpinnings of spatial working memory deficits in developmental dyscalculia.

Main Methods:

• Functional MRI (fMRI) was used to assess brain activity in 8-10-year-old children with DD and controls during a spatial working memory task.
• Behavioral assessments of working memory proficiency were conducted outside the scanner.
• Correlations between neural activity and behavioral performance were analyzed.

Main Results:

• Both groups exhibited spatial working memory-related activity in occipital and parietal regions.
• Children with DD showed significantly weaker neural activation in the right intraparietal sulcus, right insula, and right inferior frontal lobe compared to controls.
• Children with DD demonstrated impaired working memory proficiency on performance tests and significant correlations between right IPS activity and performance on verbal digit span and Corsi Block Tapping tests.

Conclusions:

• This study provides the first evidence of spatial working memory involvement in the neural basis of developmental dyscalculia.
• Deficits in spatial working memory may impede the formation of mental number lines and the retrieval of arithmetic facts in children with DD.