Juan,
So far my spontaneous activations happen in ways i'm totally unaware of. I'm beginning to think i'll just not bother w/ them because i don't seem to be able to pick them up. But, i know they happen.
If you are a student, then you should observe this in class & during discussions.
For me, it usually goes like this: I do something i think is my idea. Then at some later time when i pick up a book i'd PhR, i notice that very same thing.
They say to do this you have to PhR at least 3 books daily for a few months. Notice the story in the PhRing book about the tennis guy. Maybe you play an instrument or participate in sports. PhRing a lot of books in this area should show up in those areas even w/o activation.
I know i PhR everything i could find on stress w/o activating much & it really helped me.