Children with higher testosterone less likely to share their toys

Children who have index fingers shorter than their ring fingers are less likely to share their toys, research suggests.

Evidence already exists to show they are more aggressive - but the new study shows they are also more selfish - and won't even share with friends.  

It is known those who have an index finger that is shorter than their ring finger are exposed to greater amounts of testosterone in the womb because the hormone affects the development of finger length.

Anthropologists argue that higher levels of the hormone during pregnancy leads to a 'masculinisation effect' in both boys and girls. Testosterone levels remain high as children age.

Austrian experts observed the habits of dozens of boys and girls given the choice of who gets glittery stickers to make the conclusion.  

It is known those who have an index finger that is shorter than their ring finger are exposed to greater amounts of testosterone in the womb

It is known those who have an index finger that is shorter than their ring finger are exposed to greater amounts of testosterone in the womb

How was the study carried out?

Some 45 youngsters were asked to name their best friends in the class, to allow the scientists to see if that had an effect on the results.

And the children, who were all aged between six and nine, had the size of their index and ring fingers measured as part of the study. 

Known as the 2D:4D ratio, scientists are able to analyse this to determine the levels of testosterone someone was exposed to in the womb.

Those who have an index finger that is shorter than their ring finger are exposed to greater amounts of testosterone in the womb. 

While too much oestrogen for women makes the two fingers very similar in length, or the ring finger longer than the index finger. 

The relative lengths

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