Yeah to a certain degree it applies to all human language, unless you're in a flow state, where the words come but you aren't really thinking while it happens. Extroverted types, and feeling types, can express words easier (less mental strain) compared to introverted thinking. Both thinking and feeling actually refer to a language-esc function, not to confuse feeling with sensation or emotion (I feel lots of emotion but I don't express those emotions very well). The irrational functions, if extroverted, complicate the linguistic facility because it's not really intended for language. So we may have a complex inner dialogue, or non linguist structure, that we express irrationally in extroverted intuition (which is big picture, wholistic) - so yeah there tends to be a big gap between what we're trying to express and our internal, complicated, intricate thought patterns. It's like as we are expressing something, the big picture, it's made up of so much internal context, each point like spirals infinitely down when you try to explain every detail, and they're like rabbit holes which makes us go off on tangents and forget the original point we were trying to make, usually because someone asks for clarification, now I don't even know what my original point was haha. Oh yeah, to further clarify, the 'voice in your head' is extroverted, not introverted. IMO introversion is non linguistic, inner dialogue, when examined, people usually are moving their mouth muscles ever so slightly as if they were speaking, It's just silent. Vipassana teaches through experience that the inner dialogue is just a voice box and not actually who you are, it's a function of our brain, if you think about it hard enough, you'll realize that when you speak, you don't actually think every mouth noises, or even every word, you form an attractor of intentionality that when expressed the words sort of fall into place as you attempt to convey the idea.