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DW Science explainer on the default mode network: what your brain does when you aren’t focusing on anything, and why it’s important.
The brain remains active when attention is not directed at an outside task. During these quieter moments, the default mode network (DMN) helps people revisit memories, imagine possible futures, understand others and connect experiences, contributing to a changing sense of self.
Researchers identified the DMN while comparing brain activity during demanding tasks with activity at rest. It is a network of brain regions that interacts with the salience network, which detects important signals and helps redirect attention when needed. Smartphones fill many idle moments, but the article says there is no strong evidence that scrolling harms mental health by reducing DMN time; it notes that problematic smartphone use can increase stress.
In short
- The brain stays busy when attention drifts.
- The default mode network helps build a sense of self.
- Evidence on scrolling reducing this activity is limited.
Explained simply
The default mode network is a group of connected brain regions that becomes more active when a person is not concentrating on a specific outside task. Researchers identified it by comparing brain activity during demanding tasks with activity during rest.
In quieter moments, the network is involved in recalling experiences, imagining the future and thinking about other people. It works alongside the salience network, which helps notice important things and shift attention.
Together, these processes help people connect experiences and develop a sense of who they are. Phones often fill spare moments, but there is no strong evidence that scrolling harms mental health by reducing time for the default mode network; problematic phone use can, however, add stress.
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