I'm sure I read it in The Body Keeps the Score - I have a copy but it's really hard to search so I tried to Google hoping it would be referenced. The closest I got was "Culture shapes the expression of traumatic stress" (from that book) and a few other references that suggests he did focus on culture at some point. I recall distinctly he also mentioned that those suffering hallucinations often became Shamans or similar.

I wish I could say with absolute certainty it was that book, but I'm about 95% there. Whatever I was reading at the time also delved into how hallucinations affect people with sensory issues - auditory hallucinations manifesting as phantom hands speaking sign language, or how people blind from birth never have auditory hallucinations.

While googling to validate what I said, I did come across an interesting article here that might interest someone with a genuine curiosity for this topic. I skimmed over it, work has me overloaded and burned out so even trying to locate stuff like this feels a bit overwhelming right now. I did notice how I can't search that page for the keywords 'fear', 'panic', 'terror', 'scare/y' so I suppose it doesn't focus on those aspects of it.

The Body Keeps the Score is an indispensable resource, so I'd recommend reading it regardless, but unless someone challenges what I'm writing here I probably wont go looking for it specifically (my apologies).