I will note that he used LSD in his therapeutic practice. He was a psychiatrist, and under controlled circumstances he would prescribe specific amounts of LSD in the same manner any other drugs would be prescribed. He would of course sit with his patients, through their experiences.
And the idea for the Perinatal Matrices came about simply because certain thematic and cathartic elements kept showing up over and over and over. People remembered their births, both figuratively and literally. It may be that the brains of infants can’t form memories right away, but in my own view clearly the field which contains them, which is the root of life, does. Logically, if newborns can’t form memories, then it would not matter in the slightest how they were treated upon birth; that we place importance on getting them nursing quickly shows that common sense and experience indicate their early experiences do matter.
And to be clear, entering into these non-ordinary states, letting this content come up, proved to be of enormous therapeutic value. People felt better. They were freed from negative emotional patterns that in some cases had haunted them their entire lives. That fact alone indicates value in this idea.