Ever wonder why you're exhausted trying to maintain relationships with everyone from your high school lab partner to that person you met at a conference three years ago? Here's something that might surprise you: anthropologist Robin Dunbar's research suggests our brains can only handle about 150 social connections, and of those, only five make up our innermost circle. That's right, five.
Bring two or more people together and they will immediately begin to synchronize or fall into rhythm with one another. Not only do we tend to subconsciously mimic one another's movements, postures, facial expressions, and gestures, but recent breakthroughs in technology have revealed we also sync up our heart rates, blood pressure, brain waves, pupil dilation, and hormonal activity. This phenomenon is known as interpersonal synchrony, and it is possibly the most consequential social dynamic most people have never heard of.
If you're someone who rejoices at self-serve checkouts, automated banking, or online shopping-and I'll admit, I tick two out of three of these boxes-have you ever stopped to think about how taxing these shifts might be on the incidental social interactions we have with others? Recently, while reading Why Brains Need Friends: The Neuroscience of Social Connection-And Why We All Need More, I realised just how much these incidental social opportunities are diminishing.