Scientists have shown that there is a degree of truth in the old adage that love is blind.
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They have found that feelings of love lead to a suppression of activity in the areas of the brain controlling critical thought.
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It seems that once we get close to a person, the brain decides the need to assess their character and personality is reduced.
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The study, by University College London, is published in NeuroImage.
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The researchers found that both romantic love and maternal love produce the same effect on the brain.
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They suppress neural activity associated with critical social assessment of other people and negative emotions.
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The UCL team scanned the brains of 20 young mothers while they viewed pictures of their own children, children they were acquainted with, and adult friends.
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The team found that the patterns of brain activity were very similar to those identified in an earlier study looking at the effects of romantic love.
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Both studies recorded increased activity in parts of the brain's "reward system".
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When these areas are stimulated--as they can be by food and drink, or even monetary gain--they produce feelings of euphoria.
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But perhaps more surprisingly, both studies also showed reduced levels of activity in the systems necessary for making negative judgements.
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Lead researcher Dr Andreas Bartels said it was crucial that both romantic and maternal love were viewed by the brain in a highly positive way--because both were crucial to the perpetuation of the species.
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