Sociability traced to particular region of brain

People with a genetic condition called Williams syndrome are famously gregarious. Scientists, looking carefully at brain function in individuals with Williams syndrome, think they may know why this is so. The researchers at the Stanford University School of Medicine showed that parts of a particular brain region known as the amygdala react more powerfully in Williams syndrome patients than in developmentally normal subjects — or in subjects with delays in development not caused by Williams syndrome — when exposed to facial expressions conveying positive emotions.

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