A post "What European DNA Can Say About Ancestry, Disease Risk, and Cultural Traits" on The Spittoon, 23andMe.com's blog, tends to reinforce national stereotypes.
"23andMe researchers found that a number of social and cultural traits were strongly associated with a person's predicted genetic ancestry of origin in Europe. A self-reported diagnosis of alcoholism was more common than average among people of predicted Irish ancestry for instance, while people with predicted Balkan ancestry were more likely to describe themselves as extraverts."As shown by these maps from the Spittoon post, alcoholism and extraversion showed similar northwest to southeast gradients. Could there be a genetic basis to the old joke about two Englishmen being marooned on a desert island but never speaking to each other as they hadn't been introduced?
Unfortunately there's no link to the detail of the study.
Another map shows a distribution of the profiles analysed. None are shown for Scotland. Perhaps they're too canny to pay for a DNA analysis!