(excerpts for discussion)
"If a person suffers the small genetic accident that creates Williams Syndrome, [s]he'll live with some fairly conventional cognitive deficits, like trouble with space and numbers, but also a strange set of traits that researchers call the Williams social phenotype or , less formally, the 'Williams personality': a love of company and conversation combined, often awkwardly, with a poor understanding of social dynamics and a lack of social inhibition.