The above image was illustrated by Joe Scordo for Hidden Scents circa 2014, and based on the 1950's illustrations credited to Penfield and Rasmussen, which is need of an update, no?
Brain computer interface turns mental handwriting into text on screen
May 2021, phys.org
My rudimentary understanding of the brain says that the patterns coming from you head when you use any form of motor control would be much easier to see that patterns from simply visualizing letterforms. Something about the somatosensory cortex anatomical map.
For the first time, researchers have deciphered the brain activity associated with trying to write letters by hand. Working with a participant with paralysis who has sensors implanted in his brain, the team used an algorithm to identify letters as he attempted to write them. Then, the system displayed the text on a screen—in real time.
via Howard Hughes Medical Institute: High-performance brain-to-text communication via handwriting, Nature (2021). DOI: 10.1038/s41586-021-03506-2
'Rough' words feature a trill sound in languages around the globe
Jan 2022, phys.org
"They demonstrate a deep-rooted and widespread association between the sounds of speech and our sense of touch."" -Mark Dingemanse, Co-author and Associate Professor in Language and Communication at Radboud University
Also, kiki bouba.
via Radboud University, home of the Limbic Signal patron saint Asifa Majid: Bodo Winter et al, Trilled /r/ is associated with roughness, linking sound and touch across spoken languages, Scientific Reports (2022). DOI: 10.1038/s41598-021-04311-7
Why writing by hand makes kids smarter
Oct 2020, phys.org
"The use of pen and paper gives the brain more 'hooks' to hang your memories on. Writing by hand creates much more activity in the sensorimotor parts of the brain. A lot of senses are activated by pressing the pen on paper, seeing the letters you write and hearing the sound you make while writing. These sense experiences create contact between different parts of the brain and open the brain up for learning. We both learn better and remember better," says Van der Meer.
via Norwegian University of Science and Technology: Eva Ose Askvik et al. The Importance of Cursive Handwriting Over Typewriting for Learning in the Classroom: A High-Density EEG Study of 12-Year-Old Children and Young Adults, Frontiers in Psychology (2020). DOI: 10.3389/fpsyg.2020.01810