I’m able to do two things at once if one uses the language processing centers of my brain and the other uses motor memory and neither is particularly demanding

I’m able to do two things at once if one uses the language processing centers of my brain and the other uses motor memory and neither is particularly demanding of concentration. That’s about it. Either or both can use a bit of visual processing. The human brain doesn’t handle multitasking well. I hypothesize that any effective multitasking is limited to one left-brain and one right-brain dominated task.