Yes, those terms fail to correlate to brain activity. But that doesn't mean that there's not a real, subjective quality to different kinds of productive mental

Yes, those terms fail to correlate to brain activity. But that doesn't mean that there's not a real, subjective quality to different kinds of productive mental activity. Working with your hands (and with shapes or sounds or patterns) is a great way to take a break from doing heavy semantic/problem-solving thinking, and it has the crazy side effect of gradually giving you skills you probably wished you had.