21. In a Norwegian twin study , the heritability of self-efficacy in adolescents was estimated at 75 percent. 22. His fields of research being psychopathology and personality psychology, he is known for employing twin studies . 23. The twin study did not confirm this. 24. The Neubauer study differs from all other twin studies in that it followed the twins from infancy. 25. In so doing he anticipated the modern field of behaviour genetics, which relies heavily on twin studies . 26. Another source of data indicating a significant biological aspect of some mental health disorders is twin studies . 27. This 1973 twin study , " failed to provide convincing evidence of a genetic component in creativity ". 28. In addition to the twin study method, scholars have used gene association studies to analyze voter turnout. 29. Twin studies and family association studies have demonstrated that there are definite genetic factors underlying obsessive-compulsive disorder.30. However, this may be an overestimation, as new twin studies estimate the heritability at between 60-90 %.
