[shiro]

"Sometimes I have to pause when I lose my train of thought."

In speaking, pause can carry meaning. A lot of it. It doesn't need to be a calculated pause; the fact that you're lost there can tell "what you really are" to the audience, if you're totally engaged to the act of presenting yourself.

I don't speech a lot but I act. It is often emphasized in acting that words don't matter much. It is often the case that you convey messages that's even opposite from what you actually say. In tech speech you don't want too much subtext, but still, there are more bandwidth in nonverbal channels than the actual content of the speech. If you only look at the words it might be less than well thought-out writings, but in speech there is other information.

(BTW, as you find more ideas while writing essays, actors find more insights while speaking lines---deeper meaning of lines, or deeper understanding of characters, that sometimes the author hasn't realized consciously. I'd just say they are totally different things. I prefer finding out deeper meanings of a given script by acting it out, to writing a new script.)