Like your brain when you know you know a word but it's just not surfacing in your mind. I'm guessing I'm not that different from the average human and I can 'f

Like your brain when you know you know a word but it's just not surfacing in your mind. I'm guessing I'm not that different from the average human and I can 'feel' something physically while I'm searching for the word. I've always wondered what that was.