Interesting and positive story, because the closer we get to understanding the triggers, the closer we are to mitigating the symptoms of autism.

Shedding new light on brain function in autism, a new study suggests that there is an oversupply of synapses in at least some parts of the brains of children with autism, and that the brain’s ability to thin out the number of synapses is compromised.

The finding provides clues to how autism develops from childhood on, and might help explain some symptoms like oversensitivity to noise or social experiences, as well as why many people with autism also have epileptic seizures. It could also help scientists in the search for treatments, if they can develop safe therapies to fix the system the brain uses to clear extra synapses.  http://www.nytimes.com/2014/08/22/health/brains-of-autistic-children-have-too-many-synapses-study-suggests.html?_r=0

The study, published Thursday in the journal Neuron, involved tissue from brains of children and adolescents who had died from ages 2 to 20. About half of the children had autism; the others did not.