London: Scientists have discovered the origin of intelligence after identifying a `genetic accident` 500 million years ago when the genes that enabled humans to think and reason evolved. Researchers led by the University of Edinburgh have discovered how humans - and other mammals - evolved to have intelligence. They found that intelligence in humans developed as the result of an increase in the number of brain genes in our evolutionary ancestors. Scientists also believe that the same genes that improved our mental capacity are also responsible for a number of brain disorders. The researchers suggest that a simple invertebrate animal living in the sea 500 million years ago experienced a `genetic accident`, which resulted in extra copies of these genes being made. This animal`s descendants benefited from these extra genes, leading to behaviourally sophisticated vertebrates - including humans.
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