I've recently heard a podcast, in which Dr. Helen Fisher suggests that there are "4 broad personality types", and each one is associated with a particular neurotransmitter:
The corresponding Platonic thinking style, Keirsey temperament type (according to some readers, not Fisher herself), and color can be seen in parenthesis.
- Explorer (creative; Artisan temperament, yellow) = dopamine
- Builder (sensible; Guardian temperament, blue) = serotonin
- Director (reasoning; Rational temperament; red) = testosterone
- Negotiator (intuitive; Idealist temperament; green) = estrogen/oxytocin
I'm interested if there's indeed scientific evidence to support that for different people their affinity for a certain neurotransmitter is increased to such degree that it manifests in a noticeable difference in personality?