It's generally known that we continuously lose a bit of our brain cells (neurons) everyday. And it is said that since we have about 100 billion cells to begin with, we'd have more than enough for our lives. OK, but that doesn't sound entirely encouraging, especially when you are feeling getting old.
Well, it turns out that not all parts of brain continuously shrinks. I came across a book while in Japan that taught me that
hippocampus, if stimulated appropriately, could regenerate more neurons than it loses. The book also gave me some very interesting insights about how brain works, and I was
fascinated by it because it scientifically explained our conventional notions about how we should "think outside the box", "challenge old thinking", "do what you love to be successful", etc. The book,
unfortunately, is only in Japanese, but I'll list some of its interesting points.
Hippocampus basically processes information (i.e. determine whether it's important to remember, how it should be categorized, etc.) to create our memory. This is the gate for data input, so the larger
hippocampus' capacity, the better your brain works.
The scientific reason that you should think outside the box or be in exciting/new environment is to increase regeneration of brain cells. Studies have found that mice, as well as humans, who were continuously exposed to exciting and new environment increased brain cells significantly more than those who stayed in dull and unchanged environment. Interesting thing here is that those in the dull environment could start regenerating more once they change their environment. So even if you never forced yourself to be in that reinventing environment, you can always change that and see the effect. Another interesting point here is that you can also change your point of view or look things differently
without changing the environment to see the same positive effect.
The need for challenging your old way of thinking is somewhat related to needing to stimulate your
hippocampus, but more of it has to do how brain works. Memory doesn't get deleted (You may not be able to recall it easily, but that doesn't mean it's gone - it just means that it gets harder to recall one thing as you accumulate more memory), so the brain tends to stick with previously used way of categorizing and processing information. In addition, brain may "
fabricate" some information in order to make sense out of fragment or illogical information. We unconsciously patch our memory so that the brain doesn't get confused. So conscious effort to challenge old thinking is needed.
And about "do what you love" -
Amygdala, which plays important roles in emotions, is located right next to the h
ippocampus and is closely linked with how h
ippocampus determine what to memorize. The more
heightened the a
mygdala, the more memorable event it will become. And you do better with what you remember most (with favorable emotions, of course).
So doing something new, challenging old way, and focusing what you love to do are all scientifically correct ways to better yourself by actually
increasing your brain cells. Now that I think about it, the reason that I constantly struggled to find
excitement in my job when I was working was probably because I didn't find enough fulfillment and challenge.