In Mental Fatigue: Costs and Benefits, Boksem and Tops advance that mental fatigue results from the brain's decision to save energy:

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Yet, on "Time", Dr Marcus Raichle argues that: "while the brain burns a lot of energy, any changes in brain activity and energy use during a tough mental task are minute".


Considering these statements, if mental work does not consume large amounts of energy and mental fatigue is caused by energy investment, why does mental work cause fatigue?


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