Why would “smarter” brains work less hard? One strong bet is that when we are inexperienced—when we still have a lot to learn—we have to make a conscious effort to think about what we’re doing. But later, after we’ve become more adept, much of what initially took effort becomes automatic.
The good news is that functioning on autopilot allows us to expend less brain energy on the routine aspects of the work. Our expertise allows us to direct our energy elsewhere."