Developmental changes in mental arithmetic: evidence for increased functional specialization in the left inferior...

Area of Science:

• Neuroscience
• Cognitive Development
• Developmental Psychology

Background:

• Mental arithmetic is a critical cognitive skill for academic success.
• Understanding the neurodevelopmental trajectory of arithmetic reasoning is essential.

Purpose of the Study:

• To investigate age-related changes in brain activation during mental arithmetic tasks.
• To identify neural correlates of cognitive maturation in arithmetic reasoning.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity in subjects aged 8-19 years.
• Participants judged the correctness of arithmetic equations presented visually.
• Analysis focused on brain regions involved in numerical processing, memory, and attention.

Main Results:

• Older subjects exhibited greater activation in the left parietal cortex (supramarginal gyrus, anterior intra-parietal sulcus) and left lateral occipital temporal cortex.
• Younger subjects showed increased activation in prefrontal cortex regions (dorsolateral, ventrolateral prefrontal cortex, anterior cingulate cortex) and the hippocampus/dorsal basal ganglia.
• Age-related changes in activation were not linked to gray matter density differences.

Conclusions:

• Findings suggest increased functional specialization of the left inferior parietal cortex for mental arithmetic with age.
• Development involves a decreased reliance on working memory, attention, and declarative/procedural memory systems.
• The study provides novel evidence for functional brain maturation in arithmetic reasoning.