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Pessimists are born, not made "'s all the fault of a molecule"
was revealed by a search of the University of Michigan published in the journal' Archives of General Psychiatry '. It would be the presence a substance known, NPY, showing the glass is half empty

) Washington, February 8, 2011 - Pessimists are born, not made: some people are genetically programmed to be negative. A study by the University of Michigan, published in the journal 'Archives of General Psychiatry', found high levels of a chemical in the brains of people pessimistic view that seems to affect the world.

The researchers found that levels of the molecule called 'neuropeptide Y' (NPY) determine directly if we see a 'glass half empty' or a 'glass half full'. Those with the lowest levels of the substance are much more negative and have more difficulties to cope with stressful situations.

are also more susceptible to depression. To arrive at these conclusions, the researchers subjected a group of people into a functional magnetic resonance imaging, scanning the activity of a number of volunteers and displayed on a screen of neutral words (like 'material'), negatively charged words (like ' murderess') and positively charged words (such as' hopeful ').

In response to negative words, those with low levels of NPY showed a strong activity in the prefrontal cortex, which is involved with emotional processing. While those with a higher level of NPY have showed a more moderate response.

In a second test, subjects reported their emotional experiences during a stressful challenge. The researchers injected into the muscle of the jaw a dose of saline to produce a moderate pain for 20 minutes without causing permanent damage.

levels of pain perceived by each person were measured on a scale of one to 10. The researchers assessed the positivity and negativity of the subjects before and after the challenge of pain. Well, people with low levels of NYP were more negative before and after the test, in the sense that they were more emotionally affected. Finally, the researchers compared the amount of NYP with depressive disorders to see if there was an association
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And it was just that: people with little NYP were more likely to suffer from depression. "We hope that this study - said Brian Mickey, a psychiatrist and coordinator of the research - to guide us towards the assessment of individual risk for developing depression and anxiety"

Source Agi