A default mode network subsystem supports both item and associative word encoding: Insights from a meta-analysis

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Memory Research

Background:

• The default mode network (DMN) is implicated in memory processes.
• Previous research suggests the DMN may interfere with memory encoding due to mind-wandering.

Purpose of the Study:

• To conduct a meta-analysis of fMRI studies on word memory encoding.
• To elucidate the specific roles of DMN subsystems in item and associative word encoding.

Main Methods:

• Meta-analysis of functional magnetic resonance imaging (fMRI) studies.
• Focus on subsequent memory paradigms using word stimuli.

Main Results:

• The dorsomedial prefrontal cortex (dmPFC) subsystem of the DMN facilitates successful word encoding.
• This dmPFC subsystem is involved in both item and associative word encoding.
• Left inferior frontal cortex regions within the dmPFC subsystem show heightened activity during associative encoding, supporting contextual integration.

Conclusions:

• The dmPFC subsystem of the DMN plays a crucial facilitative role in memory encoding.
• Contrasting roles of DMN subsystems challenge traditional views, advocating for a nuanced understanding of DMN function in memory.