Studies have shown that people whose brains respond quickly to change lean liberal, and those whose brains respond slowly lean conservative. Psychic domain theory suggests that there are two axes of change, one oriented toward adaptation to changing circumstances, and the other oriented toward changes in consciousness. This suggests that the current findings are indeed, only half the entire story, and that the adaptation axis has yet to be identified.
Before I continue, I would like to state my feelings on the nature of human existence. I believe "we" are work that is carried out by our bodies; proper, "we" are electrons, electrical current. Neurons form the physical mass which regulates the flow of electrons, and gives us coherent identity. Neurons are very much like people, more so than other cells that we know of: they compete, communicate, and perhaps in ways that we have not substantiated, fight amongst themselves. Neurons communicate via neurotransmitters shared between them, the same influences their actions. But do all neurons respond to all neurotransmitters equally? It seems unlikely given that the neurons themselves have observable textural variation and too, the degree to which regions of the brain are specialized. Saying the brain is "complex" doesn't cut it for precision research, or even for accurate understanding of the individual dispositions held by what is in fact a living community.
I hypothesize that there is locked in the DNA of neurons a disposition for or against change. The behavior of this distinction must be very subtle and only emergent as a collective community dynamic. The details are fuzzy, but the point is that because neurons themselves produce all neurotransmitters used in mental processing -- no other organs of the body seem to have a direct role in neuron production -- it must be that it is the neurons which determine what transmitters are produced. There must be as-yet unknown genetic dispositions toward some neurotransmitters over others, which I believe in the macro yield not only political disposition but also the IM aspects, elements, and even the functions themselves. Particularly, localized colonies which have certain dispositions toward one transmitter over another, will engage in behavioral patterns distinct from those of other colonies as a factor of their selectivity, thereby processing different forms of information.