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I've been trying to remember what I learned a long time ago about brain structure and behavior, and looking into the types of things that could be causing Miranda's odd behavior. As I understand it, and please correct me if you know about these things, some of the basic emotions, like rage, are often the result of brain activity in central, very old, brain structures. A primary brain structure involved in rage is the amygdala, which is buried at the very center of the brain and is part of the primitive limbic system. In horses, and humans, the behavior that is expressed when the amygdala is usually activated is moderated/overseen/controlled by the prefrontal cortex - which is well-developed in both horses and humans. There is some evidence that horses, and humans, can experience "amygdala storms", where the neurons in that area fire explosively, resulting in rage behavior that may not be modulated by the prefrontal cortex, perhaps due to structural defects in the brain. This is almost like a seizure, but it does not result in unconsciousness or uncontrolled movement, but rather in expressed rage. Occasionally, tumors in the area of the amygdala can cause unpredictable and uncontrollable rage behaviors.
As you can see, I'm still thinking (too much) about all of this. My daughter will be home next weekend from Florida, and will be facing some hard decisions about what to do with Miranda. In her case, the situation is complicated by her imprinting - she has no fear of people and in fact is attracted to people, which makes her issues even harder to deal with. I'm trying to get prepared for my daughter's return so that I can support her to the extent I can. I very much appreciate all of your thoughts and kind thoughts - thank you again.