A book suggestion: Zen and the Brain – Toward an Understanding of Meditation and Consciousness By James H. Austin https://mitpress.mit.edu/books/zen-and-brain

A book suggestion: Zen and the Brain – Toward an Understanding of Meditation and Consciousness By James H. Austin https://mitpress.mit.edu/books/zen-and-brain https://mitpress.mit.edu/books/zen-and-brain (Austin is a professor emeritus of neurology, neurologist, researcher, and Zen practitioner) Austin covers the effect of psychedelics and their effects relative to meditation but nothing about meditation on drugs if I remember correctly. The personal parts are easy to read. Neuroscience and chemistry are much harder. The reference and source notes section is valuable if you are doing research.