Several studies found double standards in how people tend to view emotional abuse by men versus emotional abuse by women. Follingstad et al. found that, when rating hypothetical vignettes of psychological abuse in marriages, professional psychologists tend to rate male abuse of females as more serious than identical scenarios describing female abuse of males: "the stereotypical association between physical aggression and males appears to extend to an association of psychological abuse and males". Similarly, Sorenson and Taylor randomly surveyed a group of Los Angeles, California residents for their opinions of hypothetical vignettes of abuse in heterosexual relationships. Their study found that abuse committed by women, including emotional and psychological abuse such as controlling or humiliating behavior, was typically viewed as less serious or detrimental than identical abuse committed by men. Additionally, Sorenson and Taylor found that respondents had a broader range of opinions about female perpetrators, representing a lack of clearly defined mores when compared to responses about male perpetrators.