Sorry how I feel when I am focused has nothing to do with being focused or you being focused. It's a personal thing.
You know you have focus when your mind stays with what you are doing. You forget time and it seems to go quickly. You're getting answers, getting the work done at a steady pace.
As I said, "Purpose will help you to from mind probing questions and find answers with a focused mind.
Find your purpose... then you find a more focused mind.
Spontaneous activation is just something that happens... if you do anything to try and make it happen it's not spontaneous activation it's manual activation.
Alex