You’ve put your phone down. The screen is black. Yet your mind keeps flicking through thoughts—like an endless digital feed you didn’t ask for. This is not random distraction. It’s a conditioned neurological loop.
The culprit is the default mode network (DMN)—a brain system active during rest, daydreaming, and self-referential thoughts (Andrews-Hanna, Smallwood, & Spreng, 2014). But in our hyperconnected era, the DMN has become overstimulated, leading to persistent rumination, anxiety, and mental fatigue.