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I'm not sure that neuroplasticity covers the size of the amydala and the frontal lobe. Wiki defines neuroplasticity in the following way.

Neuroplasticity, also known as neural plasticity, or brain plasticity, is the ability of neural networks in the brain to change through growth and reorganization. These changes range from individual neuron pathways making new connections, to systematic adjustments like cortical remapping. Examples of neuroplasticity include circuit and network changes that result from learning a new ability, environmental influences, practice, and psychological stress.

https://en.wikipedia.org/wiki/Neuroplasticity

My understanding of the phsyological differences between liberals and conservatives are that the structure of the brain itself was different - that conservatives have larger amydalas while liberals have larger frontal cortexes. I might be wrong, and I'll take a look into that.

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