This type of basic research seems likely to help unravel the genes that cause human behavior.
In this rodent study, higher dopamine:norepinephrine ratio induced grooming behavior while lower dopamine:norepinephrine ratio induced digging behavior when exposed to odors (a stressor). The implication for humans could be that dopamine neurotransmission (suppressive of behavior in general) and norepinephrine neurotransmission (stimulating activity in general) would be related to A- trait and A trait respectively, in general.
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