For many years, it was thought that boys were more likely than girls to have learning difficulties including dyslexia. However, a 1990 research study by Sally Shaywitz, professor in learning development at the Yale University School of Medicine and the co-director of the Yale Center for Dyslexia and Creativity, suggested otherwise. She proposed that the problem lay in the school’s identification methods and the presentation between boys and girls was much closer to par. More recently, however, a highly respected 2004 study found that dyslexia was two to three times more prevalent in boys than girls, so the jury is still out on a final conclusion.