I had to editorialize the title a bit, so it fit. Original title: "I’ve spent 25 years studying the brain—I never do these 4 things that destroy our memory as we age". Especially the one about avoiding multitasking struck a chord, as modern times encourages us to do that more and more.
How wide a timeframe determines multitasking? To me it is watching a YouTube video when you should be coding and possibly shitposting on Teams all at once. The code is never good, and you have a nagging feeling that you should turn the video off. It maybe works for more repetitive things like tweaking large xml files with repeating patterns.
On the other hand, consider a coder who also is trying to make it with a music career. Setting time aside to practice and reach out to open mic nights or other opportunities can’t be multitasking can it?
But as soon as ADHD comes into play, you’re looking at music opportunities when you should be refactoring some badly written class. Right back into multitasking.