Memories are fleeting depending on a host of chemical balances, life changes, and other external factors. You can impress new thoughts on certain people without much effort. Gaslighting is a great example of imprinting new realities. On a greater scale, Your mind differentiates reality from non-reality with dreams. When your trip becomes indistinguishable from dreams, your mind is left pulling apart the pieces and making sense of everything. Traumatic events and major life changes can also leave your mind in a similar state.

I’ve been doing experiments with my wife to “inject” a different time in her head when I come to bed. My results are mixed during the moment, but she claims to everyone I come to bed at the time I’ve injected. I’m sure in a more controlled environment with patients one could “inject” anything that seems plausible to the naked eye