Self-referential encoding in the developing brain.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Developmental Psychology

Background:

• Episodic memory is enhanced by self-referential information.
• The default mode network (DMN), particularly the medial prefrontal cortex (mPFC), supports self-referential thought and memory in adults.
• Neural mechanisms of self-referential memory encoding in children remain unclear.

Purpose of the Study:

• To investigate the neural development of self-referential memory encoding in children and adolescents.
• To identify the interaction between self-referencing and episodic memory within the mPFC.
• To examine age-related changes in DMN activation during self-referential encoding.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to scan 83 participants aged 7-25.
• Participants answered self-referential or semantic questions about objects during encoding.
• Region-of-interest analyses focused on the mPFC and hippocampus.

Main Results:

• Self-referential encoding led to superior memory recall compared to semantic encoding across all age groups.
• Increased activation was observed in the DMN and inferior frontal gyrus (IFG) during self-referential encoding.
• Age-related increases in activation were found in the dorsal mPFC and left IFG, with interactions in the anterior mPFC and left hippocampus.

Conclusions:

• Self-referential memory facilitation matures throughout development, interacting with the episodic memory system.
• The mPFC plays a crucial role in integrating self-referential processing and episodic memory development.
• Findings suggest a developmental trajectory for self-referential memory from childhood to adulthood.