A neuroscientist discovered the brain network that builds your sense of self. Psychedelics turn it off. So does 110 Hz sound. The question is why the off-switch exists at all.

In the early 2000s, Marcus Raichle at Washington University discovered a brain network that activates when you're doing nothing — daydreaming, ruminating, thinking about yourself. He called it the default mode network. It turned out to be the system that builds and maintains your sense of being a separate self.

In 2012, Robin Carhart-Harris at Imperial College London put volunteers on psilocybin inside an fMRI scanner. The assumption was that psychedelics would increase brain activity. The opposite happened. Psilocybin suppressed the default mode network. The narrator went quiet. The brain entered a state of dramatically increased connectivity between regions that normally never talk to each other.

The same shift shows up in the 110 Hz acoustic studies from Neolithic stone chambers. Different input, same neurological direction. The self-system quiets and something else opens up.

The question nobody has a clean answer for: if the default mode network evolved to keep you alive, why does the brain retain a built-in mechanism to turn it off?

Full write-up: https://thegodmachine.substack.com/p/your-brain-has-a-door