I don't think at all. According to a former candidate for high office, I'm a deplorable subhuman who only seeks to minimize pain, enhance pleasure, and increase DNA.
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Most of my ideas pop into my head visually, as some have noted above. I also used to finish sentences from other people, aloud, until back in high school somebody advised me that was extremely annoying.
I also used to talk to myself aloud when alone, but sound carries, and I was advised to quit that, too. Quite some time ago I discovered that the internal monologue was pretty much stimulated at root by the visuals. I had to do quite a bit of introspection, a la Wilhelm Wundt, to discover this.
I also frequently have music running in the background. Sometimes it's banal earworms, like "Tutti Frutti" yesterday, and sometimes it's complete passages from more complex orchestral music.
(That's also why I credit animals with more intelligence than most people think... they "think" visually, aurally, and by smell and taste, but mostly can't communicate in detail verbally. I note that lately some people studying animal behavior have approached this idea.)
We had a lady where I used to work who had to be situated a little bit off in the boonies since she could not squash her verbalizations as she worked in her cubicle. They finally broke down and gave her a closed-door office as soon as one was available. "Like a fox," I thought, but actually kept my mouth shut.
For once.
Pterry, 230RN
REF (Long Tall Sally and Tutti Frutti):
https://vimeo.com/265741856Now that's thinkin' with your feet. And knees. And sacrum. And upper body. And arms.