In the context of taking psychoactive mushrooms to get a proper trip, there are the concepts of a good trip, a bad trip, and steering your trip towards the former and away from the latter, based on your thought patterns and emotions (so actively pursuing the intent to have a good trip in your mind).

Now I've never microdosed mushrooms, but it's not hard for me to imagine that this same concept applies, of actively pursuing a good experience, which can steer that experience in a good direction. It will just be at a much smaller scale.

For myself I think of this phenomenon as a kind of self-fulfilling prophecy (not meant as a judgement about others) which helps me to keep in mind that I'm the one in control (assuming doses are not excessively high, I think others in this thread call those "heroic doses").