Neurodevelopmental changes in verbal working memory load-dependency: an fMRI investigation

Area of Science:

• Neuroscience
• Cognitive Development
• Developmental Psychology

Background:

• Working memory (WM) development is linked to brain structure changes, particularly in frontal-parietal regions.
• The cerebellum's role in verbal WM and its load-dependent activation alongside frontal and parietal cortices is established in adults.
• It remains unclear how WM load-dependency evolves across childhood, adolescence, and adulthood in cerebro-cerebellar networks.

Purpose of the Study:

• To investigate developmental changes in WM load-dependent cerebro-cerebellar activation.
• To examine age-related differences in the nature of load-dependency in verbal WM networks.
• To compare neural recruitment patterns across childhood, adolescence, and adulthood.

Main Methods:

• Utilized functional magnetic resonance imaging (fMRI).
• Employed a verbal Sternberg WM task with three distinct load levels.
• Analyzed data from 30 participants aged 7 to 28 years, spanning childhood, adolescence, and young adulthood.

Main Results:

• Neural substrates of linear load-dependency demonstrated significant age-related changes.
• Adolescents and adults exhibited linear load-dependency in frontal, parietal, and cerebellar regions.
• Children showed linear load-dependency predominantly in the left ventral prefrontal cortex.

Conclusions:

• Cerebro-cerebellar verbal working memory networks are activated similarly across developmental stages.
• Reliance on parietal and cerebellar regions for increasing task difficulty in verbal WM significantly shifts from childhood to adolescence.
• These findings highlight critical developmental transitions in cognitive control networks supporting working memory.