Tuesday, September 6, 2011

A few amazing facts about your Brain!

Your brain uses less power than your refrigerator light
The brain uses 12 watts of power. Over the course of a day, your brain uses the amount of energy contained in two large bananas. Curiously, even though the brain is very efficient, it's an energy hog. It is only 3 per cent of the body's weight, but consumes 1/6 (17 per cent) of the body's total energy. Most of its energy costs go into maintenance; the added cost of thinking hard is barely noticeable.

You can't tickle yourself
When doctors examine a ticklish patient, they place his or her hand over theirs to prevent the tickling sensation. Why does this work? Because no matter how ticklish you may be, you can't tickle yourself.
This is because your brain keeps your senses focused on what's happening in the world; important signals aren't drowned out in the endless buzz of sensations caused by your actions. For instance, we are unaware of the feel of a chair and the texture of our socks, yet we immediately notice a tap on our shoulder.
To accomplish this goal, some brain region must be able to generate a signal that distinguishes our touch from someone else's. The cerebellum, or “little brain”, may be the answer. It is about 1/8 of our total brain size - a little smaller than our fist - and weighs about 4oz (113g). It is also the best candidate that scientists have for the part of the brain that predicts the sensory consequences of our own actions.
The cerebellum is in an ideal location for distinguishing expected from unexpected sensations. If a prediction matches the actual sensory information, then the brain knows that it's safe to ignore the sensation because it's not important. If reality does not match the prediction, then something surprising has happened - and you might need to pay attention.