Children with mathematical learning disability fail in recruiting verbal and numerical brain regions when solving...

Area of Science:

• Neuroscience
• Developmental Psychology
• Educational Psychology

Background:

• Solving multiplication problems shifts from numerical to verbal strategies during development.
• Children with mathematical learning disability (MD) may have impaired numerical mechanisms.
• This impairment might hinder the transition to verbal mechanisms in MD children.

Purpose of the Study:

• To test if numerical mechanism impairment prevents MD children from transitioning to verbal mechanisms in multiplication.
• To compare brain activations in numerical and verbal regions between MD and typically developing (TD) children.
• To investigate the effect of problem size (small vs. large) on brain activation.

Main Methods:

• Compared brain activations in MD and TD children (3rd-7th graders) during multiplication tasks.
• Used independent localizer tasks to identify numerical and verbal brain regions.
• Analyzed activations in response to small and large multiplication problems.

Main Results:

• MD children showed reduced activation in both verbal (left IFG, LMTG-STG) and numerical (right SPL/IPS) regions.
• MD children's numerical activation was only reliable for small problems, suggesting limited engagement.
• TD children showed problem-size modulation in verbal regions, with better language skills correlating with stronger verbal engagement.

Conclusions:

• MD children exhibit impairments in both numerical and language-related processes crucial for multiplication.
• MD children's difficulty engaging numerical mechanisms for larger problems hinders developmental strategy shifts.
• Language and numerical processing deficits contribute to mathematical learning disability in multiplication.