These traits do not survive in spite of being aberrent.
They survive because they are advantageous.
The Troublesome Bloom of Autism
Gradually he saw a pattern. At birth, children with autism had normal-size brains. But by the time they were a year old, the brains of most autistic children had grown far beyond average. The average adult human brain weighs 1,375 grams, but Courchesne encountered one 3-year-old autistic boy whose brain weight was estimated at 1,876 grams. The MRI scans further revealed that only certain parts of the brain became larger. The growth was striking in the prefrontal cortex, the region just behind the eyes that is responsible for language, decisions, and other sophisticated thinking. Courchesne also saw an increase in both the gray matter (consisting of dense clusters of neurons) and the white matter linking different regions of the brain. This explosive neural expansion continued in many autistic children until the age of 5, and then it stopped. Past that age, Courchesne found, the rate of brain growth slowed in autistic children, falling behind that of ordinary children. By the teen years, some brain regions actually started to shrink.
People With Autism Possess Greater Ability to Process Information
People with autism have a greater than normal capacity for processing information even from rapid presentations and are better able to detect information defined as 'critical', according to a study published March 22 in the Journal of Abnormal Psychology. The research may help to explain the apparently higher than average prevalence of people with autism spectrum disorders in the IT industry. The task involved looking at a circle of letters flashed very briefly on the screen and searching for some 'target' letters. At the same time, the participants were also asked to detect a small grey shape that occasionally appeared outside the letter circle. When only one or two letters were flashed on the screen, the researchers found that both groups could successfully find the letter and detect the shape. However, making the search task more challenging by increasing the number of letters significantly impaired the detection performance of the typical adults -- but not of the adults with autism spectrum disorders, who were able to detect the extra shape just as well in the more challenging conditions. When the task became harder, they significantly outperformed the typical adults.
