What was her/his name again.....ahh got it! You all know the situation described in the title. You forgot something and start to search your memory and then after quite a while it jumps right in front of you, out of nowhere.

My questions are: 


What happens in the brain during that moment of awareness? 
Is it different from when we know something right away, since the subconscious mind is working for quite a while to produce the answer? 
Is it possible to measure this moment and was it done already?
You'll want to look up literature on the "Tip of the Tongue" (TOT) phenomenon.  It's been studied since the 60s I believe and can be experimentally reproduced.