Julie Bjelland talks about the trait of high sensitivity and our brain responses. See article "Brain-Training To Help Highly Sensitive People Thrive" highlysensitive.org/12159/
HSP therapist Julie Bjelland, LMFT comments on part of what she covers in her online course:
Some of what we do is talk about our particular limbic system - we have an overly activated amygdala for example, and that creates that fight flight freeze part where our brain doesn't always understand that we're not actually in danger so it sends out signals to to release adrenaline and that's when we notice our heart racing.
And what's important to understand is... if you kind of think of it as having two parts of your brain: there's the emotional brain and there's the cognitive brain.
When the emotional brain is activated, the cognitive brain kind of goes to sleep.
And within the cognitive brain is where you have rational thought and facts and information.
Whereas in the emotional brain, you are trapped in emotion, irrational thought - you can lose focus, lose access to memory.
That's where we can get very reactionary and even have meltdowns.
We even talk about the sensory experiences. A lot of a HSPs don't realize that some of the extreme irritability you might have on particular days or even moments when you feel like you're angry, for example - sometimes that's actually sensory triggering
Remember this is a trait that's called sensory processing sensitivity.