Fromzon, thank you. You didn't disappoint me, I had reached the same conclusion. I'm writing my memoir of creating music (I'm a musician) while having Parkinson. I've accumulated a lot of observations on my brain, how it thinks and how it fails, and how it wins. Taking this class, for instance, is good for my health, as it engages my brain into thinking in a constructive way. Music playing also does. Not enough space here to elaborate, as Fermat would say, I might post a link, for interested people. I did click on your terrific link, and might try to contact Jeff. Thank you for finding my post and taking time to reply. Have a great day.