When psychologists Catherine Caldwell-Harris and Ayse Ayçiçegi compared U.S. and Turkish samples, they found that having "an orientation inconsistent with societal values" is a risk factor for poor mental health. The findings support what the researchers call the personality-culture clash hypothesis: "Psychological adjustment depends on the degree of match between personality and the values of surrounding society." To the extent that introverts feel the need to explain, apologize, or feel guilty about what works best for them, they feel alienated not only from society but from themselves.