**Losing [[focus]] after a long time on the same thing could be the brain becoming aware of the opportunity cost of focusing on only one thing. ** You may not be limited by physiology when it comes to the duration you can [[focus]] on a thing, but instead your brain starts to resist because it starts to think “am I still focusing on this thing? Aren't there other things that might be more important? If you're focusing only on A, you might miss B or C that could save your life or allow you to have more children. Thus we evolved to slowly lose interest in things. **** # More ## Source - [[Freakonomics Radio]] ## Related - [[Decision Making]]