Mental time travel and default-mode network functional connectivity in the developing brain

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Cognitive Neuroscience

Background:

• A core brain network, overlapping with the default-mode network (DMN), is involved in memory recall and future imagination.
• DMN activity increases during low attention demands, prompting investigation into its resting-state functional connectivity.
• Previous research suggests shared neural substrates for memory and imagination, but the role of DMN functional connectivity in development is unclear.

Purpose of the Study:

• To investigate the relationship between default-mode network functional connectivity and individual differences in past remembering and future imagination.
• To explore how these relationships manifest in the developing brain of children and adolescents.
• To examine the combined contributions of functional connectivity and structural properties (cortical arealization) to mental time travel.

Main Methods:

• Functional connectivity of the default-mode network was assessed in children and adolescents.
• Performance in tasks of past recall and future imagination was measured.
• Statistical analyses examined correlations between DMN functional connectivity, task performance, and cortical arealization.

Main Results:

• Functional connectivity within the default-mode network was significantly related to the quality of past remembering in youth.
• A marginal relationship was observed between DMN functional connectivity and future imagination.
• Local cortical arealization also contributed to explaining individual differences in recall and imagination.

Conclusions:

• Task-independent functional architecture of the default-mode network modulates mental time travel in the developing brain.
• These findings support a common neuronal basis for memory and imagination.
• Understanding both functional and structural brain properties is crucial for elucidating the neural basis of complex cognition.