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It's more productive here to provide the reference to the original Nature article rather than just some news magazine's interpretation of it, especially since the magazine article makes it very difficult to locate it just by following their link.
Nature 439, 466-469 (26 January 2006) | doi:10.1038/nature04271
Empathic neural responses are modulated by the perceived fairness of others
Tania Singer1,2, Ben Seymour1, John P. O'Doherty3, Klaas E. Stephan1, Raymond J. Dolan1 and Chris D. Frith1
It's all interesting enough, and the areas of brain activation correlate well to the volunteer's responses on questionnaire's, indicating the regions being measured are likely to be relevant to the responses. Of course, these types of studies are somewhat unsatisfying in that they don't tell us anything about why the men and women differ in their responses.
One thing I wish had been included in the supplemental figures in the Nature article that wasn't was a comparison of how the male and female volunteers responded to male vs female players. They should have this data because they counterbalanced the study appropriately to control for gender differences in subjects and confederates, and I'd be really curious to know if there are any differences in empathy shown FOR women vs men, as opposed to BY women vs men.
Another thing that would be useful to know, but was not determined, is whether there were any differences between the sexes of subjects in how they perceived the game. What I mean is, is it possible that because this is all done in a lab where everyone knows they are part of an experiment, do the women more readily realize it was just a game, and the "unfair" player was just playing a role and isn't necessarily an unfair person than the men do? In the supplemental results provided, there was a pretty clear difference between men and women in the category of "deserved pain" when rating the "unfair" players, which is being interpreted as part of a desire for revenge, but what if women would equally desire revenge if this were a real-life situation, but in a lab setting, are able to recognize that this person is really just role-playing and thus remain empathetic, while the men are more prone to not distinguishing role-playing from reality? (Think about gender differences in people who play role-playing games; what if this is getting more at the reason why such games are more stimulating to more men than to as many women?) But, that STILL leaves wide open the question of WHY.
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