There's a really interesting research about how cognitive endurance differs by incentive. Some countries famously do a lot better than other countries, while others are much worse. Learning requires that we put energy and attention toward a task. The signal we could call fatigue doesn't mean we should stop learning - it could even be a good thing.
Can exercising your body boost your brain's stamina? Are some people just born lazy? And why did Angela stop reading “Us Weekly”?