Mr Happy, in condensing a long article, I may have left out some vital details. There were two populations compared. One was a group including sharers and non-sharers, neither set previously identified with behavioural problems, indeed being too young for much of this to show. In this well behaved group with similar backgrounds, the ones who suggested sharing had a particular gene which the ones which did not suggest sharing lacked. The other group compared children with bad behaviour and found a relationship between that same gene and bad behaviour. The scientists studying the sharing behaviour were surprised by the connection they found because of this previously recognised association.
Yes, nurture was involved - the argument was that the gene enabled a more pronounced response to environmental input, rather than instigating a particular style of behaviour. It was a response not observed in children lacking the gene.


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Penny