Action observation network in childhood: a comparative fMRI study with adults

Area of Science:

• Neuroscience
• Developmental Psychology
• Cognitive Neuroscience

Background:

• Limited understanding of the action observation network (AON) and mirror neuron system (MNS) in children compared to adults.
• Age-related properties of AON/MNS are not well-characterized.

Purpose of the Study:

• To explore AON/MNS activation in children and adults during observation of complex versus simple hand-grasping actions.
• To investigate age-related differences in AON/MNS activation patterns, including laterality and variability.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to study brain activation.
• Participants (children and adults) observed first-person views of simple and complex hand-grasping actions.
• Analysis focused on premotor cortex, inferior frontal gyrus, and parietal lobe activations.

Main Results:

• Children exhibited widespread and more bilateral AON/MNS activation compared to adults, with higher inter-subject variability.
• A linear increase in the lateralization index with age was observed.
• Children showed a hand identity effect in the anterior intraparietal cortex (AIP) and greater activation for complex actions.

Conclusions:

• Action representations are sensitive to developmental mechanisms and exhibit physiological plasticity.
• The findings support the role of AIP in action-related hand identity and action complexity.
• The plasticity of AON/MNS in children offers potential for motor deficit recovery and rehabilitation strategies.