Even thinking tired. Neuroscientists photograph brain fatigue

The pen, according to the saying, weighs less than the hoe. And the thoughts will be as ethereal as the air, but it is not true that they do not cost effort. Intellectual work tires the brain as hoeing tires the back, and a group of French neurologists from the Institut du Cerveau in Paris was able to observe the effects of a hard day of reasoning in a study.