The decision that most affects your happiness

There are two premises that lead Moran Cerf, a neuroscientist at Northwestern University, to believe personal company is the most important factor for long-term satisfaction.

The first is that decision-making is tiring. A great deal of research has found that humans have a limited amount of mental energy to devote to making choices. Picking our clothes, where to eat, what to eat when we get there, what music to listen to, whether it should actually be a podcast, and what to do in our free time all demand our brains to exert that energy on a daily basis.

The second premise is that humans falsely believe they are in full control of their happiness by making those choices. So long as we make the right choices, the thinking goes, we'll put ourselves on a path toward life satisfaction.

Cerf rejects that idea. The truth is, decision-making is fraught with biases that cloud our judgment. People misremember bad experiences as good, and vice versa; they let their emotions turn a rational choice into an irrational one; and they use social cues, even subconsciously, to make choices they'd otherwise avoid.

But as Cerf tells his students, that last factor can be harnessed for good.

His neuroscience research has found that when two people are in each other's company, their brain waves will begin to look nearly identical. 

"This means the people you hang out with actually have an impact on your engagement with reality beyond what you can explain. And one of the effects is you become alike."

From those two premises, Cerf's conclusion is that if people want to maximize happiness and minimize stress, they should build a life that requires fewer decisions by surrounding themselves with people who embody the traits they prefer. Over time, they'll naturally pick up those desirable attitudes and behaviors. At the same time, they can avoid the mentally taxing low-level decisions that sap the energy needed for higher-stakes decisions.

Chris Weller writing in Business Insider