Brain imaging techniques now let us observe mental fatigue in real-time, revealing that the brain, like muscles, grows tired from sustained effort. Mental fatigue arises when your brain senses it will run out of resources if it continues working at the same intensity.
One way this might happen is when brain cells use up resources faster than they are being replenished. Your brain tries to remedy the situation by disengaging its attention, and you might experience this as your mind wandering away from what you are trying to focus on and being drawn towards lighter work and easier decisions.
These guidelines might address your work environment, the load you can carry, and the pace of your work, including mandatory breaks. But if your job involves heavy mental loads, the rules aren’t so clear. Since the brain doesn’t perspire, ache, or give obvious signs of strain, we often assume it never really tires — or that its fatigue can be ignored to meet a deadline or finish a 2 AM call.Dr. is a University of Cambridge-trained physician, neuroscience researcher, and ophthalmic surgeon.
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