How many phone numbers do you have memorized now versus how many numbers you had memorized before cell phones came out?
Think your map reading skills have gotten better since you started having a GPS in your car?
In 2007 there was a study that compared 3,000 people and found that the younger respondents were less likely to remember some simple personal information such as family member’s birthdays or phone numbers.
Studies have shown that calculators may have decreased people’s ability with simple math problems.
A 2012 study found that 89% of those surveyed reported feeling phantom vibrations - the physical sensation that their phone was vibrating - even when it wasn’t. Researchers believe that our brains now can misinterpret physical sensations like an itch for a vibrating phone.
https://www.sciencedirect.com/science/article/pii/S0747563212000799
Of course CGM can get in the way of paying attention to the physical signals and processing all the mental signals. And thinking about all the things that you have done recently, like eating or correcting or dosing.
What you should do before you look at your CGM, is make a guess. Before every blood check, make a guess. Process all the signals, analyze what has been happening, what you have eaten, how much insulin you have in your system. Do that to keep your brain sharp. Try to know your BG before you check it and before you look at your CGM. Keep those skills sharp.
I have suggested this to @ClaudnDaye a while back:
And also suggest it to @daisymae a while back: