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The Emory researchers who identified the four phases of meditation found that when meditators slip out of the focused attention of the TPN and into Mind Wandering, the DMN activates. The wandering mind of the DMN has a “me” orientation, focusing on the self. It may flit from what’s going on at the moment (“Is that a mosquito buzzing?”) to future worries (“I’m nervous about next week’s exam”) to the past (“I’m so mad at my brother Jim for calling me a sissy at my fifth birthday party”). The precuneus contributes to both self-referential focus and episodic memory. Disturbing memories are played and replayed. The idle brain defaults to what is bothering us, both recent and long-past events. These egocentric musings of the wandering mind form the fabric of our sense of self. When you quiet your TPN in meditation, you open up a big empty space in consciousness. For a few moments, the brain is quiet, and you feel inner peace. Then the engine starts revving. The DMN kicks in, bringing with it a cascade of worries and random thoughts. You’re doing 2,000 RPM in Park, but going nowhere. And it gets worse. The DMN has a rich neural network connecting it with other brain regions. Through this, it busily starts recruiting other brain regions to go along with its whining self-absorption. It commandeers the brain’s CEO, the prefrontal cortex. This impairs executive functions like memory, attention, flexibility, inhibition, planning, and problem-solving. 2.5. Nerves from the Default Mode Network reach out to communicate with many other parts of the brain. The DMN also recruits the insula, a region that integrates information from other parts of the brain. It has special neurons triggered by emotions that we feel toward other people, such as resentment, embarrassment, lust, and contempt. We don’t just think negative thoughts; we feel them emotionally too. At this stage, the meditator isn’t just wallowing in a whirlwind of self-centered thoughts. The DMN has taken the brain’s CEO hostage, while through the insula it starts replaying all the slights, insults, and disappointments we’ve experienced in our relationships. The quiet meditative space we experienced just a few moments before has been destroyed. This drives meditators absolutely nuts. No sooner do they achieve nirvana, the still, quiet place of Bliss Brain, than the DMN serves up a smorgasbord of self-absorbed fantasies. It pulls us into negative emotional states—then drags the rest of the brain along behind it. The DMN. Hmm . . . that acronym reminds me of something: “the DeMoN.” The DMN is the demon that robs me of the inner peace I’m seeking through meditation
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Dawson Church (Bliss Brain: The Neuroscience of Remodeling Your Brain for Resilience, Creativity, and Joy)