Aspergers and Sensory Difficulties
  Many kids with autism and Aspergers have unusual reactions to sensory experiences (i.e., experiences related to the senses of touch, hearing, vision, smell, and taste). About 40 per cent of kids with autism have some abnormality of sensory sensitivity. There is now evidence to suggest that the incidence may be the same for Aspergers. The senses of touch and hearing are most commonly affected; certain kinds of touch, especially light pressure, and certain sounds may be experienced as intolerable. This difficulty is known as sensory defensiveness. Interestingly, while kids with autism and Aspergers are usually hypersensitive to sensory input, at other times they may be under-reactive, particularly to pain and changes in temperature. It is not uncommon for over-reactivity and under-reactivity to co-exist in the same individual. The following examples illustrate these points.     One child became so agitated by the sound of the vacuum (over-reactive) that every time the house cleaners ar...