Norepinephrine and adrenaline drive alertness.

Fear increases alertness, and so does positive expectation. Visualizations and changes/novelty can both be used to trigger fear or interest.rR1

  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.)