Cause of Autism
There is strong evidence of a biological/neurological basis for autism. New methods for studying brain anatomy and functioning have shown that there are consistent differences between the brains of autistic and non-autistic individuals. It appears that structural differences can occur in one, or several parts of the brain, and still result in autism.
There is no single, known cause of autism.
Some of the factors believed to be potential causes are:
* Genetic factors (there are strong family links)
* Exposure to viral diseases and infections (such as measles
* Physical trauma (e.g. birth injury)
* Metabolic disorders (such as PKU)
Poor parenting or lack of love does not cause autism.
Other Facts About Autism
There are four times as many males as females affected by autism. For Asperger’s Disorder the ratio is nine males to one female.
Autism occurs with equal frequency within all ethnic and socio-economic groups.
Many people with autism develop epilepsy, often during puberty and adolescence.
There is continuing debate regarding the percentage of people with autism who have intellectual disability. Earlier studies (DeMyer, 1975 and Knoblock, 1982) estimate that about 75-80% of people with Autistic Disorder have intellectual disability. When people with Asperger’s Disorder and Atypical Autism are considered the figure drops toabout 20%.
Variations
People with autism vary enormously.
The effects of autism may be mild or severe and not every characteristic is evident in every person.
Different features of autism may be displayed in different contexts.
People with autism, because of their understanding of the world and sensory sensitivities, often experience overwhelming anxiety, frustration and confusion when faced with the demands of everyday life. Anxiety, frustration and confusion may give rise to behaviours like repetitive movements (finger flicking, rocking), self isolating behaviours and sometimes aggression towards others, themselves, or the environment.