 Some proponents of survey methods claim that such worries have very low prior probability and should not be taken seriously without experimental confirmation. Those who raise them, however, claim to have significant independent evidence of their general relevance (Cullen 2010; Scholl 2007) or their importance in producing the particular results at issue (Bengson 2013). Some of these problems seem difficult to control for without engaging subjects in something like philosophical dialogue and dialectic (see Kauppinen 2007)—i.e., by doing philosophy with them—which is thought by many experimental philosophers to be a form of biasing or data contamination.