…. Research on the link between relationships and physical health has established that people with rich personal networks — who are married, have close family and friends, are active in social and religious groups — recover more quickly from disease and live longer. But now the emerging field of social neuroscience, the study of how people’s brains entrain as they interact, adds a missing piece to that data.
The most significant finding was the discovery of “mirror neurons,” a widely dispersed class of brain cells that operate like neural WiFi. Mirror neurons track the emotional flow, movement and even intentions of the person we are with, and replicate this sensed state in our own brain by stirring in our brain the same areas active in the other person.
Mirror neurons offer a neural mechanism that explains emotional contagion, the tendency of one person to catch the feelings of another, particularly if strongly expressed. This brain-to-brain link may also account for feelings of rapport, which research finds depend in part on extremely rapid synchronization of people’s posture, vocal pacing and movements as they interact. In short, these brain cells seem to allow the interpersonal orchestration of shifts in physiology.
Such coordination of emotions, cardiovascular reactions or brain states between two people has been studied in mothers with their infants, marital partners arguing and even among people in meetings. Reviewing decades of such data, Lisa M. Diamond and Lisa G. Aspinwall, psychologists at the University of Utah, offer the infelicitous term “a mutually regulating psychobiological unit” to describe the merging of two discrete physiologies into a connected circuit. To the degree that this occurs, Dr. Diamond and Dr. Aspinwall argue, emotional closeness allows the biology of one person to influence that of the other.
John T. Cacioppo, director of the Center for Cognitive and Social Neuroscience at the University of Chicago, makes a parallel proposal: the emotional status of our main relationships has a significant impact on our overall pattern of cardiovascular and neuroendocrine activity. This radically expands the scope of biology and neuroscience from focusing on a single body or brain to looking at the interplay between two at a time. In short, my hostility bumps up your blood pressure, your nurturing love lowers mine. Potentially, we are each other’s biological enemies or allies.