Goal-congruent default network activity facilitates cognitive control.

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• The default network is typically associated with spontaneous thought and impaired executive control.
• Its role in externally directed tasks remains debated, particularly concerning the congruence between task demands and internal mentation.

Purpose of the Study:

• To investigate if default network engagement enhances executive control performance when aligned with task demands.
• To explore the hypothesis that default network activation aids tasks involving long-term memory retrieval.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to scan 36 healthy young adults.
• A novel two-back task assessed working memory for famous versus anonymous faces.
• Participants performed three conditions involving matching anonymous or famous faces.

Main Results:

• A facilitation effect was observed when matching famous faces compared to anonymous faces.
• Greater default network activation correlated with performance facilitation during famous face-matching trials.
• This suggests the default network can support, rather than hinder, task performance.

Conclusions:

• Default network activation can contribute positively to externally directed executive control tasks.
• Contextually relevant activation of the default network facilitates goal-directed cognition.
• The findings challenge the view of the default network solely as a source of cognitive impairment.