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EEG Patterns Suggests a Potential Diagnostic Test for Autism

 
 

28/06/2012
Widely available EEG testing can distinguish children with autism from neurotypical children as early as age 2, finds a study from Boston Children's Hospital.

The study is the largest, most rigorous study to date to investigate EEGs as a potential diagnostic tool for autism, and offers hope for an earlier, more definitive test.Researchers Frank H. Duffy, MD, of the Department of Neurology, and Heidelise Als, PhD, of the Department of Psychiatry at Boston Children's Hospital, compared raw EEG data from 430 children with autism and 554 control subjects, ages 2 to 12, and found that those with autism had consistent EEG patterns indicating altered connectivity between brain regions - generally, reduced connectivity as compared with controls.

While altered connectivity occurred throughout the brain in the children with autism, the left-hemisphere language areas stood out, showing reduced connectivity as compared with neurotypical children, consistent with neuroimaging research. Findings were published June 26 in the online open-access journal BMC Medicine.

Duffy and Als focused on children with "classic" autism who had been referred for EEGs by neurologists, psychiatrists or developmental pediatricians to rule out seizure disorders. Those with diagnosed seizure disorders were excluded, as were children with Asperger's syndrome and "high functioning" autism, who tend to dominate (and skew) the existing literature because they are relatively easy to study.

The researchers also excluded children with genetic syndromes linked to autism (such as Fragile X or Rett syndrome), children being treated for other major illnesses, those with sensory disorders like blindness and deafness and those taking medications.

"We studied the typical autistic child seeing a behavioral specialist - children who typically don't cooperate well with EEGs and are very hard to study," says Duffy. "No one has extensively studied large samples of these children with EEGs, in part because of the difficulty of getting reliable EEG recordings from them."

The researchers used techniques developed at Boston Children's Hospital to get clean waking EEG recordings from children with autism, such as allowing them to take breaks. They used computer algorithms to adjust for the children's body and eye movements and muscle activity, which can throw off EEG readings.

To measure connectivity in the brain, Duffy and Als compared EEG readings from multiple electrodes placed on the children's scalps, and quantified the degree to which any two given EEG signals - in the form of waves - are synchronized, known as coherence. If two or more waves rise and fall together over time, it indicates that those brain regions are tightly connected.

(Duffy likens coherence to two people singing "Mary Had a Little Lamb" together. If they can see and hear each other, they are more likely to sing in synchrony - so their coherence is high.)

 
   
 

sciencedaily.com

 
 
 
 
 
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