So this is bound to be a qualitative comparison. I'm happy to share my understanding of the perceptual bodies and my very incomplete understanding of neuroscience and do a first pass comparison, which I don't think is the right way to group these things honestly. This is bound to offend someone with a much higher level of sophistication in neuroscience, but whatever. That article sort of backs it up even more though.
So consider serotonin and drugs like Prozac, MDMA, LSD etc whose action is on serotonin related mechanisms on the brain. These drugs are all capabale of altering your felt-perception of reality. That's the emotional body. Well, according to the teachings as synthesized by Michael Brown in The Presence Process and understood by countless others. The emotional body is the gateway to the spiritual body which I often call the vibrational body since it's a less loaded term and points to what it is experienced as. The emotional body often block the spiritual body from our awareness. That's why lsd, for example, is often accompanied by spiritual experience. You feel things deeply which then creates an opening for vibrational perception.
That perception seems to be associated with spiritual experiences. It is also linked with near death experiences, sensory deprivation, meditation, breathwork, and dissociatives. That adding a bit of serotonin to the mix would further enhance that doesn't really surprise me. Rather than anethesizing, you facilitate the conditions for experiencing something of a vibrational nature.