A study published last month in the journal Nature Neuroscience revealed that individuals with broader, more complex social networks have a larger amygdala. The amygdala is an almond-shaped mass in the brain typically associated with fear and anxiety, though it also serves other roles including interpreting emotional expressions.
The researchers made their discovery using magnetic resonance imaging to examine the study participants’ brain structures. They also asked the participants questions about their social lives. It was not clear from the study whether having a larger amygdala contributed to the participants’ active social life, or if having such a social life affected the size of the amygdala.
You can read more details about the study at Science Daily.