[Aerroon]

I don't think it's just researchers that think this.

Every time that I have a word on the tip of my tongue I have an idea in mind that I wish to express, but I simply cannot remember the word to convey the concept. That is to say that I've already thought of the idea and am now merely looking for a way to express it.

However, I think that "thinking out loud" in your head has benefits. It makes the idea you wish to express more concrete and lets you iterate on it more easily. Think of it like writing down an equation when doing math: it gets easier to reason about it when it's expressed externally. I think ideas and thinking verbally in your head work the same way.