These individual have areas in the brain that are underdeveloped. These sections in the brain formulate our social interaction and communication skills. Due to the underdevelopment of these areas of the brain, these individuals usually have difficulties in verbal and non-verbal communication, socialization, and physical activities. It is difficult for them to communicate with others to let their wants, needs, and desires be known to the outside world. Some may exhibit repeated body movements.
Some individuals exhibit sensory impairment.
Sensory impairment is when the individual exhibits an unusual reaction to physical sensations such as touch, smell, taste. Autistic children tend to exhibit an over sensitivity to these stimuli or be under-responsive. Autism typically appears during the first three years of life. A child may appear to be normal but a change in behavior and the persistence of the behavior beyond the normal developmental stage is the first indication to most parents that something is wrong. Fifteen to twenty individuals in every 10,000 births will develop Autism.