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Default Mode Network

The DMN is the parts of the brain that are active when a person is not actively engaged in a task or is daydreaming. The DMN turns off when a person is focused on a particular task, but turns on again when resting or daydreaming.

In this case, the term โ€œnetworkโ€ refers to a several regions in the brain being active and connected simultaneously.

The DMN is believed to be a source of creativity. The idea of having your best ideas in the shower stems from this.