13/05/2026
Your brain doesn’t go quiet when you stop focusing.
It switches to a system called the default mode network—a group of regions active during rest, reflection, and internal thinking. This network helps you process experiences, simulate the future, and make sense of your life.
But in some people, it doesn’t switch off easily.
Instead of supporting insight, it can turn into repetitive thinking—looping through the same thoughts without resolution. This is what we often call overthinking or rumination.
Research shows that people prone to rumination have higher activity in brain areas linked to self-evaluation. Even during tasks that require focus, this network can stay active in the background, pulling attention inward.
That’s why overthinking doesn’t feel like a choice.
It’s a pattern your brain has learned.
The important part is this:
The same plasticity that built the loop can reshape it.
Shifting attention outward, engaging in focused tasks, or interrupting repetitive thought patterns can gradually retrain how this network behaves.
The goal isn’t to eliminate the system.
It’s to bring it back into balance—so it supports thinking instead of trapping it.
Source
Harvard research (2023) and Biological Psychiatry studies on rumination and default mode network
Disclaimer
This content is for informational purposes only.
