From reading the article it didn't seem to me that this experiment controlled for other factors--such as parent interaction with babies in other times outside of stroller time. To me it seems like a question of "Which came first, the chicken or the egg?" I really don't think that which direction the baby faces for short periods of time while in a stroller had huge bearings on his/her social interaction skills. Maybe in the case of the babies facing toward the parents, that is some of the most quality, face-to-face time they get with their parents on a day-to-day basis. Whereas, children faced away from parents might have parents interacting with them the entire day, day after day and have lots and lots of face time except for the short time they spend in the stroller. I know that with our son, when he was faced toward us, he tended to lean out the side of the stroller to look around and see where he was going instead of just staring at us.