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All people have at least one sound that causes them discomfort, negative associations or irritability. The reasons for these effects may vary from association with past traumas to the volume or tenor of the sound, to serious medical conditions making a person extra sensitive to sound. When a person is easily irritated by sounds that only they seem to be aware of, or sounds that are a part of the everyday routine of living in the world, that person may be said to be noise sensitive.
The current rate for diagnosis of autism spectrum disorders (ASD) in children is one in 150. Of those, three out of four are boys. This includes children with pervasive development disorder (PDD), autism and Asperger's syndrome. An increasing number of students with ASD are being mainstreamed, and it's becoming more likely that you will encounter a child with autism somewhere sometime.
Autism is a developmental disorder that affects 1.5 million Americans. As many as 3 to 6 children in 1,000 may have autism, and that rate appears to be increasing. Whether the number of children is actually increasing, or if diagnostic procedures make it possible to diagnose more children, is matter of debate among professionals.
