Rationality requires intelligence, and the kind of intelligence that we use (for communication, progress, FAI, etc.) runs on language.
It seems that the place we should start is optimizing language for intelligence and rationality. One of SIAI's proposals includes using Lojban to interface between humans and an FAI. And of course, I should hope the programming language used to build a FAI would be "rational". But it would seem to me that the human-generated priors, correct epistemic rationality, decision theory, metaethics, etc. all depend on using a language that sufficiently rigorously maps to our territory.
Are "naturally evolved" languages such as English sufficient, with EY-style taboos and neologisms? Or are they sick to the core?
Please forgive and point me towards previous discussion or sequences about this topic.
From my experience with learning several foreign languages, morphological irregularities look scary in the beginning, but they completely pale in comparison with the complexity and irregularity of syntax and semantics. There are many natural languages with very little morphological complexity, but these aren't any easier to learn to speak like a native. (On the other hand, for example, Slavic languages have very complicated and irregular inflectional morphology, but you'll learn to recite all the conjugations and declensions back and forth sooner than you'll figure out how to choose between the verbal aspects even approximately right.)
However, the whole point is that in order to speak in a way that will sound natural and grammatical to fluent speakers, you have to internalize all those incredibly complicated points of syntax and semantics, which have developed naturally with time. Of course that nobody except linguists thinks about these rules explicitly, but fluent speakers judge instinctively whether a given utterance is grammatical based on them (and the linguist's challenge is in fact to reverse-engineer these intuitions into explicit rules).
(Even when it comes to inflectional morphology, assuming a lively community of Esperanto speakers persists into the future, how long do you think it will take before common contractions start grammaticalizing into rudimentary irregular inflections?)
I agree. However, making something look less scary in the beginning still constitutes an improvement from a pedagogical point of view. The more quickly you can learn the basic morphology and lexicon, the sooner you can begin the process of intuiting the higher-level rules and social conventions that govern larger units of discourse.
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