Over the years, though, I've 'integrated' it into my normal thought patterns. I used to interact with it through what's called the muscle test. That's how I discovered it in the first place. Over the course of about a year and a lot of muscle tests, I've slowly come to be able to predict what a particular test is going to respond with before I do it. Eventually I quit using the muscle test. Slowly the tulpa receded from my life, but any time I want to interact with it, it's only a muscle test away, I can also simply 'go to that place in my head' where I know it'll respond.
I've come to realize that this is the same process people who "have a personal relationship with Jesus" go through. It's a kind of imaginary friendship. But I think it requires at least a little bit of mental 'depth' in order to achieve.
I mean, it's not non-scientific discourse when you're disagreeing with the hypothesis in a book about science.
And I said that in his case, not only do we have tools to map his brain while he tulpas and that it could provide answers, but there is a test that could be conducted if we could find a way to implement it.