> what does this mean?
The experience of thought differs from brain to brain. For example, autistics generally experience thought differently from neurotypicals.
This happens, in part, because autistics have a different distribution of synaptic connections, which are shorter on average than is neurotypical. This typically results in an experience of disorganized thought, where multiple different parts of the brain contain independent thought, because there aren't enough connections directly between them to enforce synchronization. There are enough localized connections to allow general thoughts to happen and be operated on, but they are exactly that; localized.
Detail-oriented thinking is another well-known side effect of this, because each individual detail can easily be fit somewhere without being lost in the "big picture". Autistics are usually who you'll find sweating details that most people wouldn't necessarily care about, but they're also who you'll find sometimes getting lost in those details rather than sticking to a single clear vision. Neurotypicals, on the other paw, can miss those details if the picture as a whole looks okay to them, but they also usually won't get stuck on them in the process of executing their vision.
Note that every person is different, whether autistic or non-autistic, so there are autistics who are good at thinking in terms of the big picture and neurotypicals who are good at considering every detail. The fact that the physical mode of thinking differs doesn't necessarily mean that another can't be emulated - it just means that even if two people appear to be doing or thinking the same thing, the way it's actually implemented "in hardware" (meatware?) can differ greatly depending on neurotype, even from autistic to autistic and neurotypical to neurotypical, as the brain has no single switch between fully autistic and fully neurotypical.
Some of the statements in this comment are based on my personal experience as an autistic, some are based on anecdotes from others, and some are based on this article: https://embrace-autism.com/autism-and-disorganized-thoughts/
I've been informed that the author of the article doesn't generally do good work, but I've personally reviewed the article and believe it to still be sufficiently accurate. Additionally, this particular description of autistic disorganized thought is what originally tipped me off to the fact that the way I think is different from others. If you're not autistic and/or it doesn't describe you, please know that it perfectly describes me, which should be enough to understand how exactly the experience of thought can differ from brain to brain.
Also, psychedelics can significantly change one's mode of thinking. I use them recreationally from time to time. Somehow, they give me better executive function than my ADHD meds do.