What Is the Default Mode Network?
A brief introduction to the brain’s self-story system — and what happens when it goes quiet.
By Janeth Nuñez del Prado, LCSW | Desert Bloom Psychology & Consulting.
WHEN THE SELF-STORY LOOSENS
I first learned about the default mode network as a research assistant at the UC Davis Imaging Research Center. At the time, it was an emerging concept in neuroscience. What I didn't know then was how much it would come to shape the way I understand grief, loss, and what opens in us when the usual structures give way.
The default mode network is a set of brain regions that becomes active when we are not focused on a specific task. When you are daydreaming, letting your mind wander, sitting quietly, or moving through a familiar routine on autopilot — this is the network that comes online.
For a long time, neuroscientists thought this was the brain doing nothing. Resting. Wasting energy between the important moments.
They were wrong.
The default mode network is where the brain does some of its most significant work — constructing the narrative of who we are, integrating past experience with present feeling, imagining the future, and making meaning out of what has happened to us. It is, in a very real sense, the brain’s self-story system. T
The part of us that asks: Who am I, What does this mean, What comes next?
Under ordinary circumstances, this network hums along in the background — organizing our experience into a coherent self, filtering what gets through and what doesn’t, maintaining the structures that make reality feel stable and predictable.
But when something disrupts those structures — a loss, a trauma, a profound upheaval in how we understand our lives — the default mode network changes.
The self-story loosens.
The filters soften.
And what was previously screened out begins to come through.
WHY DYRUPTION CAN ALSO OPEN US UP
This is part of why grief and crisis can feel so disorienting — and also, paradoxically, why they can open us to things we could not access before. The same loosening that makes the ground feel unsteady is what allows deeper truth, older memory, and quieter knowing to become perceptible.
The default mode network does not just tell us who we are.
It also shapes what we are about to notice. When it shifts, so does our perception.
That shift — and what it opens — is at the heart of what I explore in The Thinning of the Veil.
I have also been thinking about what this means for children — whose default mode network is still forming, still porous, still open in ways that adults have often learned to close.
My own children teach me this every day.
More on that soon.
This piece is intended for informational purposes and is not a substitute for individualized mental health care.
