No problem at all regarding your English language comprehension. You certainly can’t control what language you were born into. For a non-native speaker, I’d say your English is very good overall.
Now knowing you are not a native English speaker, I’ll try to clarify further. Benign, and benignly in this context are less literal and more metaphoric. So instead, read it as something like neutral, natural, or something that does not concern problems with the body. Basically, something that is less common or could be perceived as being atypical, but not cause for concern otherwise. Nerve damage or degeneration would not be in that category (i.e. Those are medically significant).
I’m not exactly sure if this applies to the Korean girl or not however, as I don’t know the circumstances exactly and I don’t fully understand what you mean by “tickle nerve.” If you mean that for whatever reason she was born not ticklish with no disease or other health concerns that are causal, then yes, I agree with you in that I would include those in the spectrum (e.g., 0-10 instead of 1-10).
Thank you for your understanding & further clarification!
I think that you've basically get the intent of exampling the little Korean girl.
Yes, I indeed mean that she was born not ticklish with no disease or other health concerns that are causal. Or, more precisely, I mean that she doesn't have the capacity to experience the tickling sensation by born.
And the term 'tickle nerve' is made by me based on the term 'pain nerve'.
Just like pain nerve is responsible to get the painful sensation, tickle nerve is responsible to get the tickling sensation.
Accordingly, ppl born without tickle nerve can never experience the tickling sensation, just like ppl born without pain nerve can never experience the painful sensation.
(PS: I somewhat want to find that video concerning that Korean show and let you watch it. However, it's almost impossible to find a video that was shown at least 15 years ago)
In addition, I'm not sure if I correctly used the term 'natural neurodegeneration' in the post #24.
I used this term to indicate the phenomenon that the nerve sensitivity of many ppl tend to naturally decrease (or degenerate) throughout (natural) aging. So, they naturally become less and less sensitive to virtually all kinds of sensation, including tickling sensation.
And some of them eventually become having zero sensitivity to tickling sensation at certain age(s).
(I've really observed that many ppl have become less sensitive to tickling in some spots through aging.)
For me, the ppl who eventually have zero sensitivity to tickling sensation can also be seen as being benignly not ticklish.
Hopefully, I've also clarified everything well.
And I want to say: It may be even more challenging to research on what make ppl not/less ticklish than on what make ppl ticklish
🤔