It appears that increased availability of receptors results in expression of narcissism and aggression traits. This results in D2-like receptors causing disinhibition because there is less firing. When availability of receptors is low, there is more firing thus inhibitory functions result as well as lack of expression of narcissism and aggression traits.
While in general this function appears to be one that is genetically controlled in a recessive fashion, there appears to be partially expressed or variably penetrant expression of these genes such that partial narcissism (N-/N= and A-/A=) are possible.
Perfectionism trait , through genes like transporters, is the result of a higher dopamine level in the synaptic cleft, similarly to a lack of expression of the Narcissism and Aggression traits, but Perfectionism differs from lack of N and A and partially expressed N and A perhaps by high levels of other neurotransmitters which may not be present in the genetics of N and A traits.
The gives us a handle on why individuals behave as they do: high availability of receptors results in a sort of seeking outside of oneself as if to find something to fill those receptors while low availability of receptors results in a more static inward directed orientation since there is nothing unfulfilled inside the individuals. Besides the methods outlined in NPA theory, this general approach to observing people and asking whether they appear to be seeking or to be rather static seems to reveal the answer to the question of whether they have N and/or A (seeking),or instead have partially expressed N and/or A (not seeking but inward), or whether they have P trait (reserved seeking).
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