 Researchers who take a psychological approach to generics have also recently proposed that our judgments of generics may be sensitive to a range of content-based factors. That is, while standard semantic analyses of generics aim to treat them in an abstract, formal framework, psychologically-oriented theorists have argued instead that generic generalizations are sensitive to the nature of the property being generalized. For example, consider the generics “mosquitoes carry West Nile virus”, “sharks attack swimmers”, and “ticks carry Lyme disease”. People robustly accept such generics, despite knowing that very few members of the kind have the property in question. One possibility is that such familiar generics are accepted at low prevalence levels because the property in question is dangerous—the sort of property one would do well to avoid (Leslie 2008). This hypothesis is supported by experimental data that finds that people are more likely to accept novel generics at low prevalence levels if the property in question is a dangerous one (Cimpian, Brandone and Gelman 2010). As noted above, generics like “ticks carry Lyme disease” have proved difficult for the formal semantic approaches to accommodate. If generics are indeed sensitive to factors such as whether the property is question is dangerous or not, this difficulty would be expected—since formal semantic frameworks do not normally take into account such features of the property, but rather aim to abstract away from such content-based considerations.