Individuals at the top of their game, so called, who have mastered a domain of expertise, and who are often world class in their performance, have practiced typically a minimum of 10,000 hours. When performing, their overall levels of brain arousal tend to become lower, their are in "flow," which suggests taht for them this particular activity has become relatively effortless, even at its peack. While in flow, only those brain areas relevant to the activity at hand are activated. (Goleman, Daniel Jay, PhD. The Brain and Emotional Intelligence: New Insights. p 50-52. MA:More Than Sound, 2011)

Competency and Preference are not the same. Everyone can and generally does develop competencies in every cerebral mode. Some of the competencies may be at a very high level (e.g., mastery). It is possible for a person to develop this type of mastery in more than one of the four specialized cerebral regsions. But each person only has one preference (e.g., one specialized region with natural efficiency that allows it to use 1/100th the energy that is required by the other three modes). Competency alone may improve efficiency by 1-2 percent. While the person’s one and only preference improves efficiency by 100 percent. Thinking with “preference” uses so little energy the person feels it is easy and effortless. This was shown originally more than a decade ago by Dr. Richard Haier and subsequently by other independent researchers including Dr. Karl Pribram. (Benziger, Katherine, PhD. Thriving in Mind: The Art and Science of Using Your Whole Brain. p 250-263. IL:KBA, 2009.)

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