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Psychology unit 3 intelligence revision
Evolution of human intelligence- ecological demands
Description- Bi-pedal stance
As the climate changed and became warmer, the numbers of trees decreased and so
were replaced by grasslands. This encourages the development of a bi-pedal
stance. This may have prompted the further development of intelligence. Being
bi-pedal allows us to make tools and hands are now free to do other things. It also
means that food can be picked up and gathered to store for later and share with
other group members for the group to function well.
If a diet involves eating meat which has lots of energy then the brain size will be
bigger as the energy can help the brain to grow. Also those who eat fruit need to
think of when the fruit will be more ripe and know where it is so are more
intelligent compared to those who eat leaves that are around most of the time so
don't require intelligence. Therefore fruit eaters have bigger brains than leaf
Only a correlation so it could be that brain size influenced intelligence
leading to humans becoming more capable of hunting and eating meat.
The link between meat and brain size is a correlation so it could be that
brain size influenced intelligence leading to humans being more capable of
hunting and eating more meat.
Fruit has more energy than leaves so it could be that fruit eaters have
bigger brains than leaf eaters as they eat food that provides them with
more energy and not the differing levels of intelligence being the cause.
Some of the most successful human hunter gatherers such as the Kung San tribe in
the Kalahari Desert use highly elaborate told whereas less successful groups such
as Tasmanian Aborigines use simple tools. Tool use is linked to intelligence in the
art of making things and the creative use to solve problems with food extraction.
A bigger brain could lead to higher intelligence leading to the creation of better
tools increasing survival.
Evaluation- tool use
However it could be that better tools were made to kill animals die to a
carnivorous diet which leads to bigger brains due to increased amounts of energy.