
The topic: Preschoolers and Nature vs. Nurture
Natu

Researchers agree that the link between a gene and a behavior is not the same as cause and effect. While a gene may increase the likelihood that you'll behave in a particular way, it does not make people do things. Which means that we still get to choose who we'll be when we grow up.
Question: What would be your favourite example to illustrate nature via nurture?
Answer: My favourite is a study from Dunedin, New Zealand, conducted between 1972 and 1973. Researcher Terrie Moffitt and her colleagues investigated differences in the promoter (or 'switch') region of the brain's serotonin transporter gene which can affect the way people react to stressful life events – things like divorce or bereavement. (Serotonin is a neurotransmitter, a chemical 'messenger' that allows communication between nerve cells.)
The study found that people with one or two copies of the short version of the serotonin promoter showed more symptoms of depression following at least three stressful life events than people with two copies of the long version. For one or two events there was no difference.
In other words, your genome does not make you depressed, but makes you more susceptible to environmental pressures; in this case it makes you more likely to be depressed when you suffer several external setbacks. And that has to be how things like intelligence are determined. A clever person is not born clever, they're born more able to take in teaching, they're born capable of learning.
So it's not a gene for intelligence, it's a gene for learning. A tennis player or scholar may not have been much better at tennis or study to start with, but was innately drawn to doing a lot of tennis or study and practice that made him or her perfect. So the nature sought out the nurture.
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