http://www.drmyhill.co.uk/wiki/Edge_Effect_-_the_Brain_in_CFS After reading the above link which mentions parts of the brain are malfunctioning and what we might be deficient or have too much of by personality traites? This what i feel i closely resemble, Dopamine predominant (frontal lobes) 17% of people Thinking intuitives - rationalists, theory oriented, precise, love power, high energy extroverts, tend to addictions. Achievers, thinkers, problem solvers, pragmatic but do not take criticism. Love activities requiring intellect - crosswords, chess. Relish competition. Motto: "Never take anything personally". Too much: overly intense, driven and impulsive. Possibly violent, reckless driving, criminal behaviour. Dopamine is the "voltage" of the brain (ie height of electrical brain waves). If deficient - becomes the loner, the procrastinator. Loses energy to socialise, loses feelings of emotion. Symptom - inconsistent attention. Loss of working memory (ability to absorb information and use it for on-going processing). Addiction to boost levels: cocaine, coffee, sugar. Occupation: doctors, scientists, researchers, inventors, engineers, generals, architects. After reading this i would think i was deficient in frontal lobe dopamine, although i dont have an addiction to cocaine, coffee or sugar but do get my caffeine through pepsi max(sugar free) and i have responded to meds like bupropion/wellbutrin short term which help with dopamine levels. Interesting. How do others see where they are in these categories? I will copy an post the whole link. cheers!!!