Probably the biggest change we experienced as a family with a special needs son was puberty. With puberty and adolescence came more passive-aggressive behaviors. With age came strength. Now, put the two together, and you have more aggression, whether shown through self-harm or harm to others. The second change involved intentional manipulation of behaviors or reactions but seemingly without any rational thinking. In other words, our son believed if he punched the wall, it would create enough threat that he would maybe win something even though he did not realize that he was losing the battle. The full article is available on Autism File.