When shown pictures of unfamiliar faces , adults who were shy toddlers showed a relatively high level of activity in a part of the brain called the amygdala .
When shown pictures of unfamiliar faces , adults who were shy toddlers showed a relatively high level of activity in a part of the brain called the amygdala .
Adults , who were shy as toddlers , had stronger brain activity in a part of the brain associated with coyness .