Original sentence: A major difficulty in using existing ethnographic data to test DIT is that traditional ethnographic data tends to ignore individual and intragroup cultural variation and focus almost entirely on intergroup variation.Economist Herbert Gintis disagrees with this critique, citing empirical work as well as more recent work using techniques from behavioral economics.Kevin Laland and Gillian Brown attribute this lack of attention to DIT's heavy reliance on formal modeling
Edited sentence: A major difficulty in using existing ethnographic data to test DIT is that, due to cultural anthropology's assumption of culture as a superorganic entity, ethnographic data tends to ignore individual and intragroup cultural variation and focus almost entirely on intergroup variation.Economist Herbert Gintis disagrees with this critique, citing existing empirical work as well as more recent work using techniques from behavioral economics.Kevin Laland and Gillian Brown attribute this lack of attention to DIT's heavy reliance on formal modeling, which doesn't attract the media attention of less rigorous approaches to human behavioral evolution, such as evolutionary psychology: