Psychiatry in London found that dopamine receptors were crowded together more tightly in the brains of people with high P scores compared to those with lower scores. Dense receptor packing led to stronger dopamine signals, which in turn led to the emergence of the distinctive personality features. The connection is also seen when we look at what P stands for: Psychoticism. High P scores are a risk factor for the development of schizophrenia. That doesn’t mean that all liberals are at risk for
