What is Medial prefrontal cortex?
The medial prefrontal cortex (mPFC) is a brain region involved in self-referential processing, social cognition, value-based decision-making, and the regulation of emotional responses. It is a key node in the default mode network.
How it works
The mPFC activates when people think about themselves, evaluate their own traits, make judgments about others’ mental states (theory of mind), and assess the personal relevance of information. It also plays a critical role in extinction learning: learning that a previously feared stimulus is now safe. The mPFC provides top-down regulation of the amygdala, reducing fear responses when the context signals safety. Dysfunction of this regulation is implicated in anxiety disorders and PTSD.
Applied example
When a person who was bitten by a dog as a child gradually learns that most dogs are friendly, the mPFC is learning and applying the safety signal that overrides the amygdala’s automatic fear response. In PTSD, this mPFC regulation fails, and the fear response persists despite evidence of safety.
Why it matters
The medial prefrontal cortex is where self-knowledge, social understanding, and emotional regulation converge, making it central to the psychological processes that define human social life.
