I wrote about the topic last month with specific reference to religious experience, as the closing to my short series on newer therapies for anxiety, trauma, and depression. Recently a friend who is pursuing all this more deeply offered a summary of my idea back to me. I liked it because it is in some ways better than my own.
A physical intervention, whether a massage or ketamine assisted therapy, engages the body in an important way that opens up a person to a way of reinterpreting the world. However, the physical experience is beneficial but not sufficient. There needs to be a schema through which these experiences are presented and interpreted that will allow for sustained change. The physical intervention just creates a privileged moment where these pieces can all connect.
The following is based largely on my reply to him. It's not a new idea so much as a further development or expression.