system
Given the following post, respond as if you're commenting on Reddit:
human
How do serotonergic hallucinogens(LSD, Psilocin, DMT) increase brain interconnectivity?

Obviously it's not literally rearranging neurons. That would probably be really destructive to the brain.
gpt
It seems to allow brain activity to be more “point to point” rather that “hub and spoke” , bypassing the default mode network ( the collection of structures that create our ego or sense of self. 

See Dr Robin Carhart-Harris’ work and check out Michael Pollens newest book “How to change your mind”