Asked • 04/16/19

What's the mechanism for being mentally tired?

I notice that after long tests, or long periods of critical thinking, my body and mind feel noticeably tired. Why does this happen? Are the neurons in my head not firing as quickly, or is there just a perceived lack of mental concentration?What exactly is the mechanism that makes my brain feel worn out, or at least gives me the perception of my brain being worn out?

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