Hypersensitivity is it all neurological?

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I love animals. They are very smart and they experience basic emotions- happiness, sadness, fear, and anger. But the "human emotions" I was referring to are the subtler ones like jealousy and embarrassment, ones that really only have a social context. It's been discussed on here in the past how Aspies tend to experience more basic, concrete emotions than the subtler ones. I know that's true with me.

Animals have jealousy, I think. I've observed it in cats. One of the cats I have now, will react to the other cat getting attention by doing something which it knows, will result in a physical intervention (eg getting up on table, clawing at books in bookcase, clawing at window-screen, etc). This has become entirely predictable, such that it happens almost every time the other cat is being paid any attention. Both cats recognize their name, and respond to it, but neither can be summoned by calling their name - but the one cat in question, can be summoned by calling the other cat's name, reliably.

The other cat, nor any other cat I've met, displays any of these behaviours. It's not an endearing quality, really, it's quite frustrating.

You've never seen a jealous or embarrassed dog or cat? lol you should see what happens when ever my friend with the dog sits next to a female human, his dog will come and sit in between because she's jealous.

Question:
Does the amygdala play a significant part in hypersensitivity?
I read more than once, that they found in people with autism the amygdala enlarged up to about 20% compared to controls assessed by certain imaging techniques and post-mortem autopsy.
As hypersensitivity can often lead to a feeling of fear, could it be connected with an enlarged amygdala?
If in autists the amygdala had a normal size, could there be hypersensitivity to that degree people with autism are experiencing it?

What is the approach to improve hypersensitivity? If it is neurological then the approach to improve it would have a neurological component?

I don't know if there really is a way to improve it.

A lot of the treatments for hypersensitivities are working around them, making them easier to cope with, rather than removing them. There are some methods that are used to attempt to actually reduced the hypersensitivity, and those try to take advantage of the brain's plasticity.

Sensory Integration Occupational Therapy is what's really relevant for this.