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It evolved in humans along with intelligence to make them more adept at avoiding danger. A study of 42 people found the worst sufferers of a common anxiety disorder had a higher IQ than those whose symptoms were less severe. Scientists say their findings published in Frontiers in Evolutionary Neuroscience, suggest worrying has developed as a beneficial trait. Psychiatrist Professor Jeremy Coplan, of SUNY Downstate Medical Centre in New York, and colleagues found high intelligence and worry are linked with brain activity measured by the depletion of the nutrient choline in the white matter of the brain. He said: "While excessive worry is generally seen as a negative trait and high intelligence as a positive one, worry may cause our species to avoid dangerous situations, regardless of how remote...
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