Structural and functional variations in the prefrontal cortex are associated with learning in pre-adolescent common...

Area of Science:

• Neuroscience
• Cognitive Science
• Developmental Psychology

Background:

• The prefrontal cortex (PFC) is crucial for cognitive functions, with adolescence being a key developmental period.
• Individual differences in learning and cognitive abilities emerge during pre-adolescence.
• Understanding the neural underpinnings of these differences is vital for cognitive development research.

Purpose of the Study:

• To investigate the neural basis of individual differences in learning and inhibitory control in pre-adolescent common marmosets.
• To examine the association between sub-regional prefrontal cortex (PFC) volumes and cognitive performance.
• To explore the relationship between PFC connectivity patterns and learning abilities.

Main Methods:

• Anatomical and resting-state MRI scans were performed on 24 pre-adolescent marmosets at 8 months old.
• A 'go/no go' visual discrimination task was used to assess association learning and inhibitory control at 9 months old.
• Marmosets were categorized into 'learners' and 'non-learners' for comparative volumetric and connectivity analyses.

Main Results:

• 'Learners' exhibited significantly larger volumes in PFC areas 11, 25, 47, and 32 compared to 'non-learners'.
• 'Non-learners' showed significantly larger volumes in PFC areas 24a and 8v.
• A positive correlation was found between successful responses to punished stimuli and the volume of PFC area 47.
• 'Non-learners' displayed greater global PFC connectivity and more connections between the PFC and basal ganglia, cerebellum, and hippocampus.

Conclusions:

• Larger orbitofrontal cortex and ventromedial PFC sub-regions are associated with successful response inhibition.
• More refined PFC connectivity patterns to learning-related brain regions may be critical for cognitive performance.
• This study provides novel insights into the neurodevelopment of individual cognitive differences in pre-adolescent primates.