Decomposing Cognitive Processes in the mPFC during Self-Thinking

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Social Cognition

Background:

• The medial prefrontal cortex (mPFC), a key part of the default mode network, is activated during self-referential thought.
• Its precise function remains unclear due to its involvement in introspection and autobiographical memory.

Purpose of the Study:

• To investigate if shared cognitive processes explain the mPFC's activation during self-reference.
• To determine the extent to which other-reference, introspection, and memory tasks explain mPFC activity during self-reference.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used in 35 participants.
• Multivoxel pattern analysis (MVPA) examined neural response patterns.
• Multiple regression and variance partitioning analyzed the contribution of different tasks to mPFC activation.

Main Results:

• Neural responses in the mPFC showed both similarities and differences across self-reference, other-reference, introspection, and memory tasks.
• Each of these tasks uniquely and jointly explained significant variance in mPFC activation during self-reference.

Conclusions:

• Self-reference engages multiple cognitive processes that overlap with other tasks.
• The mPFC acts as an integration hub, combining information for self-based judgments.