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Scientists have discovered that being an only child doesn't just lead to differences in behaviour. It actually influences a child's brain development. The participants in this latest study were given tests to measure their intelligence and personality. In addition, their brains were scanned with special machines.

Although the results didn't show any difference in intelligence between the two groups, they did reveal that only children are more flexible in their thinking. But according to personality tests, they are not always really nice people.

As for the brain scanning, only children had more volume in the areas associated with language understanding. By contrast, the brains of only children had less volume in the areas which are responsible for emotions.