Although no definition of "expert writer" is given (other than the average age of the professional writer was 25), it nonetheless reaffirms the 10,000-rule -- that we have to practice something 10,000 times (some say 10,000 hours), to train our brains to be good, really good, at it.
The article is based on a scientific study of fMRIs of professional and novice writers and was published in the journal NeuroImage. It aimed " to explore brain activities associated with creativity and expertise in literary writing." The photo is one of three images published with the study and used to promote it.
I don't write longhand (see picture), so I wonder about the researchers' methodology. However, I tried to be cognizant of what I was doing the last time I was writing and it felt like it was going well. I was aware of a mixture of the two techniques employed by novice and professional writers -- imagining my novel's world and the actions of the characters I was writing about, yet also employing writing techniques, thinking about the language, to create an "effect" with my words in the text.
When I'm "in a groove," time passes without my notice. I start at 8 am and look up at 12:30, unaware that hours have passed, and I have to pick up the kiddos from schools. When stopping, there is a feeling of being jolted out of the writing world, and needing to re-orient my focus back on the here and now, kiddos and family.
Guess I need to practice some more, eh? One more reason to keep writing. Never quit, never give up (Suzuki saying).