The vivid qualitative experience of a word (or called "quale" as a philosophical jargon, "private language" as a linguistic jargon) formed by each person is intrinsically different due to one's knowledge, environment, mood, past experience, etc, even same person may form completely different private language's words at different times for a same public language word.
I once see reference here in Wikipeda, without elaboration, that the famous ancient Buddhist Yogacaraist Vasubandhu
uses the example of mass hallucinations (in Buddhist hell) to defend against those who would doubt that mental appearances can be shared.
Can anyone elaborate any historical accounts/stories or speculative explanation about Vasubandhu's argument referenced above to argue for the possibility of mental appearances to be publicly sharable? If such sharing cannot be made exactly on the same common ground, then will there always be some confusion and difference between any two people no matter what cognitive level they achieved?
As a side note, I know this is very similar to the Problem of Other Minds in modern social science where scholars and philosophers invented a term "intersubjectivity" defined here to objectify the existence of certain social common "thought communities" one unavoidably belongs to explain why people can share their private intrinsically different experiences. But I think this community-wise intersubjectivity is just like the sound of a chorus which can be entirely reduced to the superposition of individual sounds, thus seems not a necessary concept. Also per Buddhism's doctrine, the source of suffering is from objectifying private conscious experience and the following endless craving of such reified object, so I'm also interested in hearing any other different middle-way Madhyamaka-style explanations from Yogacara or any other Buddhist schools... Or does Buddhism never have an answer for such question as it belongs to papañca (conception proliferation) and thus effectively reject true possibility of exact mental appearances sharing like in the purely neutral and rational math-like ideal-forms realm?