In psychology how we define a thing is constructed from a series of observable characteristics. The problem is, there are multiple situations that can cause th

In psychology how we define a thing is constructed from a series of observable characteristics. The problem is, there are multiple situations that can cause the same series of characteristics. "Are there leading candidate hypotheses for the cause of autism?" is like asking, "Are there leading candidate hypotheses for the cause of a headache?" There is no single cause. What we do know is most people with autism do not process facial expressions as much as the average person. This causes a lack of paying attention to body language, which then ripples into most of the characteristics that define autism. Studies have shown eye training on infants can completely remove symptoms of autism. But a root cause is more complex when there are multiple. Some people get overloaded when they look at people's faces. Some just didn't pick up the proper habits of looking at others when interacting with them. The root cause can vary from person to person.