(61) During the 19th century scientists found that when certain parts of
the brain of a man were injured, he would lose the power to do certain things.
(62) And so, people thought that each part of the brain does a different
job. (63) But modem research has found out that this is not so, for it is
not easy to say exactly what each part of the brain does.
In the past fifty years there has been a great increase in the amount of
research done on the brain, Chemists and biologists have discovered that the way
the brain works is not so simple as people in general may think. Chemists tell
us that 100,000 chemical changes take place in the brain every, second. (64)
Some recent researches also suggest that we can remember EVERYTHING that
happens to us. We may not be able to recall the things we’ve heard and seen,
but it is all kept there in the storehouse of the human mind.
Earlier scientists thought that the power of one’s brain got weaker and
weaker as one grew older. But it is now thought that that is not true. As long
as the brain is given plenty of exercise it keeps its power. It has been
established an old person who has always been active in the mind has a quicker
mind than a young person who has only done physical work without using much of
his brain. (65) It is now. thought that the more work we give our brains, the
more work they are able to.