Why do some sane and very intelligent people sometimes talk out loud to themselves?

Pingju
I have encountered a few people in my real life who sometimes talk out loud to themselves. They are all sane and mostly very intelligent. But when I ask them why they do that, they mostly chuckle and won't tell me except for my friend's 11-year-old daughter.
She told me that talking out loud to herself helps her to process her thoughts properly and solve problems more efficiently. This sounds reasonable to me. Haha.
What do you think? Or do you talk out loud to yourself too? :D XD Thanks :)
Why do some sane and very intelligent people sometimes talk out loud to themselves?
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