I had heard from an adult with Asperger's that her memories are very vivid. She mentioned the death of her dog. She said that when she thought of when her dog died, she would feel the emotions that she felt as strongly as she did at the moment. Can you imagine your feelings being so strongly attached to memory? Can you imagine feeling all the pain as if you were experiencing it again? On the flipside, the happy memories are there too. I think that's why my son feels so content at my parents' house. He has only known happiness there. My parents make a special effort to make his life easy there. Also, he can sit there for hours laughing while he's thinking of funny things that have happened.