The Brain That Changes Itself is a book that contains some powerful intersections between neuroscience and the paleo lifestyle. It's by Norman Doidge, M.D., who researches at Columbia, and wrote a fascinating account of the frontiers of brain science. Some truly remarkable stuff.
The book mainly explores neuroplasticity, the idea that the brain can be changed on a neuronal level through environmental changes in stimuli. I wanted to share a couple of quotes from the book that I think my paleo people will enjoy.
In support of novel, dynamic, complex movement:
"That's why learning a new language in old age is so good for improving and maintaining the memory generally. Because it requires intense focus, studying a new language turns on the control system for plasticity and keeps it in good shape for laying down sharp memories of all kinds...Anything that requires highly focused attention will help that system--learning new physical activities that require concentration, solving challenging puzzles, or making a career change that requires that you master new skills and material...The same applies to mobility. Just doing the dances you learned years ago won't help you brain's motor cortex stay in shape. To keep the mind alive requires learning something truly new with intense focus. That is what will allow you to both lay down new memories and have a system that can easily access and preserve the older ones." (pp. 87-88)
In the world of exercise, variation is universally recognized as a good thing, but I bet most people don't truly run with the idea. When I first got into weight training as a young man, variation meant bench press one day, incline bench another day. But there is far more potential for variation in movement, and it just requires a bit of imagination. I like to think of exercise as a skill building endeavor. That way, you get the benefits of focus and learning.
I'd suggest marrying what's fun with what's challenging. So forget zumba, it's too easy, and take up salsa. Skip the weight room now and again, and throw some sand bags around. Even carpentry or gardening fit the bill.
In support of barefooting:
"Finally, they are working on 'gross motor control,' a function that declines as we age, leading to loss of balance, the tendency to fall, and difficulties with mobility. Aside from the failure of vestibular processing, this decline is caused by the decrease in sensory feedback from our feet. According to Merzenich, shoes, worn for decades, limit the sensory feedback from our feet to our brain. If we went barefoot, our brains would receive many different kinds of input as we went over uneven surfaces. Shoes are a relatively flat platform that spreads out the stimuli, and the surfaces we walk on are increasingly artificial and perfectly flat. This leads us to dedifferentiate the maps for the soles of our feet and limit how touch guides our foot control. Then we may start to use canes, walkers, or crutches or rely on other senses to steady ourselves. By resorting to these compensations instead of exercising our failing brain systems, we hasten their decline. " (pp. 90-91)
Especially in regard to aging, these ideas matter greatly. I think the takeaway here is the fundamental connection between motor processing and movement in the physical world and all that it entails (sensation, balance, etc.). Movement is a complicated mechanistic dance between many variables in the brain and body, and you can enhance those mechanisms simply by kicking off your shoes and applying yourself to something new. The results, however, are more universal and even surprising improvements and changes in brain function.
