Here are some great points from Tony Schwartz in Four Destructive Myths Most Companies Still Live By:
[The emphasis on multitasking] is based on the assumption that human beings are capable of doing two cognitive tasks at the same time. We’re not. Instead, we learn to move rapidly between tasks. When we’re doing one, we’re actually not even aware of the other.
The more anxious we feel, the less clearly and imaginatively we think, and the more reactive and impulsive we become.
… the creative process moves back and forth between left and right hemisphere dominance. Creativity is actually about using the whole brain more flexibly. This process unfolds in a far more systematic — and teachable — way than we ordinarily imagine. People can quickly learn to access the hemisphere of the brain that serves them best at each stage of the creative process — and to generate truly original ideas.
…human beings are designed to pulse intermittently between spending and renewing energy. Great performers — and enlightened leaders — recognize that it’s not the number of hours people work that determines the value they create, but rather the energy they bring to whatever hours they work.