Doesn't hellen keller provide a counterexample? She seemed to imply pretty strongly that before acquisition of language she operated more on stimulus and bodily perception rather than higher-level thought.
It's clear humans have several networks working together. Some Mathematicians report they 'see' the solution, these rely on a visual network *. Others report they prefer to do math symbolically (relying on the language network?).
Perhaps there are also multiple human paths to higher-level thought, with Keller (who lost her sight) using the language facility while others don't have to.
* Given Box 1 contents, the article authors seem unaware of the research on this? e.g.
She learned "language" later than most. The primary function for her was as communication with the outside world, not for cognition, which she was already doing from birth.
I was bemused, and thought... "people think in words?"
Apparently people with ADHD or Autism can develop the inner voice later in life.
In my 20s, language colonized my brain. Took me years of meditation to get some peace and quiet back...
Perhaps there are also multiple human paths to higher-level thought, with Keller (who lost her sight) using the language facility while others don't have to.
* Given Box 1 contents, the article authors seem unaware of the research on this? e.g.
https://www.youcubed.org/resource/visual-mathematics/
https://www.hilarispublisher.com/open-access/seeing-as-under...