A brain structure called the amygdala grows too fast in babies who are diagnosed with autism by age 2, a new study suggests.
that's involved with processing emotions, including feelings of fear, as well as interpreting facial expressions.
The children underwent MRI scans at ages six months, 12 months, and 24 months. By age 24 months, 58 of the at-risk children had been diagnosed with ASD.The researchers found that at age six months, all of the children had similar-sized amygdalae. But by 12 months, the children who would later develop autism had enlarged amygdalae compared with children who didn't develop autism and those with Fragile X syndrome.
The researchers hypothesized that early problems with visual and sensory information processing in infancy may put stress on the amygdala, resulting in its overgrowth. Studies have found that children that go on to be diagnosed with autism have problems as babies with how they pay attention to visual stimuli.
Interventions in babies at high risk of autism might want to focus on improving visual and other sensory information processing in babies, Piven said.
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