Mental capacity changes throughout the day.

As the day goes on and different activities take different tolls on the mind, especially the PFC, one becomes less effective at subsequent tasks.rR1 Ego depletion is a major contributor.

  1. David Rock, Your Brain at Work: Strategies for Overcoming Distraction, Regaining Focus, and Working Smarter All Day Long, 1st ed (New York: Harper Business, 2009). (See notes.)