Yes, this experience of knowing before verbalising confirms it for me. I find it happens most when I'm solving a problem and I know there is a line of thinking

Yes, this experience of knowing before verbalising confirms it for me. I find it happens most when I'm solving a problem and I know there is a line of thinking I could go down but have not yet gone down, an intuition for some nuance of the problem, a cross contextual connection. If I follow the feeling it materialises into words that reference the problem I am solving but until I do it remains an abstract notion. Sometimes it feels like memories of similar problems and sometimes it feels entirely abstract. Once you look at it though it disappears as it is verbalised so it can only be seen in the corner of your mind's eye.