It's an attempt by self-aggrandized pseudo-intellectuals to apply CPU architecture to human behavior.
Human behavior was around long before CPUs, and people did what they had to do to survive, and watching the hills for saber-tooth tigers while digging for tubers would have been required behavior.
People can’t really multitask. They are focused on one task at a time ans switch from task to task. Some people are a little better than others at this. But at times all can be distracted and not finish th
Jefferson's "copy" machine (now on display at Monticello) is an example.
I thought it had been shown that women are hardwired for multi-tasking. Historically, women have had to monitor children while doing other tasks. I attend many community meetings, and it is not unusual for women to meet while watching children and working on some sort of craft or food project at the same time.