Here are some tools that Rock suggests will steer the brain toward increasing creativity.
Create a positive state. Be positive in how you approach a problem.
Quiet the brain. That means reducing the neural activation, the numbers of neurons speaking to each other. Being quiet, not speaking.
Being internally focused. We can be more creative if we shut out what we see and hear in the moment. Practice mind wandering; effortlessly wander through thought, and cut down on external data.
Not working on a problem that you fail to solve. The non-conscious has the resources of the milky way. If you’re having a problem, switch to doing something else and let the non-conscious do the work.