Even though I felt personally empowered in these institutions, I feel that Bryn Mawr is a more equal environment - there are no roles to which a woman cannot aspire. A women's college is not for everybody, but it does offer a lot of good things. This is especially true in the sciences, because these majors seem so much less congenial for women at institutions like Yale or Harvard than at Bryn Mawr. At Bryn Mawr you never feel you're on a man's terrain. In general, I feel that a smaller college allows students to get to know professors better, to have more mentoring, a more intense campus life, and a real community.
Psychology has a much larger proportion of women than the other sciences.
So a single-sex college may be less important for women psychology majors than for physics majors. But, at a college like this one, you still have more opportunity to do research and to work with faculty than you might have at a larger institution. Most years, I have undergraduates working on my project on language delay. One of my undergraduate students was interested by Jewish parents and the influence of the degree of Jewish orthodoxy on parental academic expectation. She studied preschool children of varying levels of orthodoxy and found that the level of orthodoxy had no effect on how academically oriented the schools were.