Though there are individual differences in brain chemistry within each type, I also think there are similarities. There's an article about this at the Enneagram Institute's website; basically it's been hypothesized that different types have different levels of neurotransmitters in their brains, specifically dopamine (drive, motivation, energy-level, ability to concentrate), norepinephrine (related to anxiety levels, mental focus), and serotonin (feelings of well-being or lack thereof). Here's the link:
"The Enneagram and Brain Chemistry"
http://www.enneagraminstitute.com/articles/NArtTina.asp
How do you think this relates to Socionics types? I know that certain types, by their very description, likely have different levels of neurotransmitters than others (I, as an INFp and a 4w5, sometimes display symptoms of low serotonin and dopamine, but not always). Also, if a person is treated with a specific medication (i.e. an SSRI like Prozac, or a dopamine reuptake inhibitor such as Wellbutrin or L-Dopa), how do you think this would this affect his or her type?
I know this is just one variable and that there are a ton of variables that contribute to one's overall type, and also that the brain is an incredibly complex mechanism whose total actions can't be fully explained by these three neurotransmitters, but I find the topic interesting nonetheless. Thoughts?


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-problem. It seems to me that Ni dominants have similar situations, but they don't stop adding things to their list. I think they are even more likely to do new things, to get their mind off their problems. Another way to say "Ni types start to procrastinate if they have problems they can't easily solve." I get all
hidden agenda and I start giving myself strict rules - no playing until I after the exam! No TV until I have sent those emails! No diversions and no new activities until I get myself out of the mess I'm in.
