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Got a big social network Then you probably have a large amygdala(扁桃体), according to a new study that found a connection between the size of and the number of social relationships a person has. The complexity of those relationships was also linked with amygdala size.
Understanding the relationship between the size of an individual’s amygdala and his or her social relationships could help lead to treatments for a variety of conditions that involve difficulties with social connections, such as depression or autism (孤独症).
So what does the amygdala actually do "It’s strongly connected with almost every other structure in brain. In the past, people assumed it was really important for fear. Then they discovered it was actually important for all emotions. And it’s also important for social interaction and face recognition," Lisa Barrett, director of the Interdisciplinary Affective Science Laboratory at Northeastern University, says, "The amygdala’s job in general is to signal to the rest of brain when something that you’re faced with is uncertain."
Barrett says it is commonly assumed that the size of a structure reflects its computational capacity, noting that if your larger amygdala easily allows you to identify people you’ve met before at a cocktail party, you will have a much easier time connecting and socializing. "You can imagine that might be one thing someone with big amygdala might be better at and that might lay the foundation for easier formation of social bonds," she says.
Interestingly, however, amygdala size was not related to the quality of those relationships or to whether or not people enjoyed socializing. "We looked at measures of ’How much do you enjoy social interaction’ and ’Are you satisfied with your social support’ and that was not related to amygdala volume," says Barrett.
Prior research has shown that people with autistic spectrum disorders (自闭症) have smaller amygdalas, which could help explain their social problems. But these studies cannot determine cause or effect--whether having a small amygdala makes socializing difficult, or whether lack of social interaction shrinks the amygdala--or whether both factors interact and result in a smaller brain region.
"This study represents an important initial study in human neurosociology--the study of the neurobiology(神经生物学) of human living groups. The findings, while preliminary, suggest that the structure and functional capacity of our brain is influenced by the nature, quality and quantity of relational connections we--and our extended relational community--have," says Dr. Bruce Perry, senior fellow at the Child Trauma Academy who was not associated with the research.
While this study did not look at the size of people’s online social networks, the researchers plan to include those measures in future research to determine their influence.

People’s ability of enjoying social interactions（）.

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