Yudkowsky's claim to merely have been standing up for the distinction between facts and policy questions doesn't seem credible: if you _just_ wanted to point out that the organization of sports leagues is a policy question rather than a fact (as if anyone had doubted this), why would you throw in the "Aristotelian binary" strawman and belittle the matter as "humorous"? There are a lot of issues that I don't _personally_ care much about, but I don't see anything funny about the fact that other people _do_ care.
-I spend a few paragraphs picking on the "sports segregated around an Aristotelian binary" remark, because sports is a case where the relevant effect sizes are _so_ large as to make the point hard for all but the most ardent gender-identity partisans to deny.
+I just spent a few paragraphs picking on the "sports segregated around an Aristotelian binary" remark, because sports is a case where the relevant effect sizes are _so_ large as to make the point [hard for all but the most ardent gender-identity partisans to deny](/2017/Jun/questions-such-as-wtf-is-wrong-with-you-people/).
+
+But the point is general. If _any_ concrete negative consequence of gender self-identity categories is going to be waved away with, "Oh, but that's a mere _policy_ decision that can be dealt with on some basis other than gender, and therefore doesn't count as an objection to the new definition of gender words", then it's not clear what the new definition is _for_. The policymaking categories we use to make decisions are _closely related_ to the epistemic categories we use to make predictions.
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+An illustrative example: like many gender-dysphoric males, I [cosplay](/2016/Dec/joined/) [female](/2017/Oct/a-leaf-in-the-crosswind/) [characters](/2019/Aug/a-love-that-is-out-of-anyones-control/) at fandom conventions sometimes. And, unfortunately, like many gender-dysphoric males, I'm _not very good at it_. I think someone looking at some of my cosplay photos and trying to describe their content in clear language—not trying to be nice to anyone or make a point, but just trying to use language as a map that reflects the territory—would say something like, "This is a photo of a man and he's wearing a dress." The word _man_ in that sentence is expressing _cognitive work_: it's a summary of the [lawful cause-and-effect evidential entanglement](https://www.lesswrong.com/posts/6s3xABaXKPdFwA3FS/what-is-evidence) whereby the photons reflecting off the photograph are correlated with photons reflecting off my body at the time the photo was taken, which are correlated with my externally-observable secondary sex characteristics (facial structure, beard shadow, _&c._), from which evidence an agent using an [efficient naïve-Bayes-like model](http://lesswrong.com/lw/o8/conditional_independence_and_naive_bayes/) can assign me to its "man" category and thereby make probabilistic predictions about some of my traits that aren't directly observable from the photo, and achieve a better [score on those predictions](http://yudkowsky.net/rational/technical/) than if the agent had assigned me to its "woman" category, where by "traits" I mean not (just) particularly sex chromosomes ([as Yudkowsky suggested on Twitter](https://twitter.com/ESYudkowsky/status/1067291243728650243)), but the _conjunction_ of dozens or hundreds of observable measurements that are [_causally downstream_ of sex chromosomes](/2021/Sep/link-blood-is-thicker-than-water/): reproductive organs _and_ muscle mass (sex difference effect size of [Cohen's _d_](https://en.wikipedia.org/wiki/Effect_size#Cohen's_d)≈2.6) _and_ Big Five Agreeableness (_d_≈0.5) _and_ Big Five Neuroticism (_d_≈0.4) _and_ short-term memory (_d_≈0.2, favoring women) _and_ white-to-gray-matter ratios in the brain _and_ probable socialization history _and_ [any number of other things](https://en.wikipedia.org/wiki/Sex_differences_in_human_physiology)—including differences we might not necessarily currently know about, but have prior reasons to suspect exist: no one _knew_ about sex chromosomes before 1905, but given all the other systematic differences between women and men, it would have been a reasonable guess (that turned out to be correct!) to suspect the existence of some sort of molecular mechanism of sex determination.
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+Making someone say "trans woman" instead of "man" in that sentence depending on my verbally self-reported self-identity may not be forcing them to _lie_, exactly.
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+(Because it's understood, "openly and explicitly and with public focus on the language and its meaning", what _trans women_ are:
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+But it _is_ forcing them to obfuscate the probabilistic inference they were trying to communicate with the original sentence (about modeling the person in the photograph as being sampled from the "men" [cluster in configuration space](https://www.lesswrong.com/posts/WBw8dDkAWohFjWQSk/the-cluster-structure-of-thingspace)), and instead use language that suggests a different cluster-structure ("trans women", two words, are presumably a subcluster within the "women" cluster).
-[TODO sentences about Lia Thomas/Cece Tefler/Andrea Yearwood; feats occured after Yudkowsky's 2018 Tweets, but I claim that this kind of thing was easily predictable to anyone familiar with sex differences]
-But the point is general.
-If any concrete negative consequence of gender self-identity categories is going to be waved away with "Oh, that's a mere _policy_ decision that can be dealt with on some basis other than gender, and therefore doesn't count as an objection to the new definition of gender words",
-The categories we use for policy decisions are very closely related to the categories we use
-Similarly with categories in general, and sex (or "gender") categorization in particular. It's true that the same word can be used in many ways depending on context. But you're _not done_ dissolving the question just by making that observation.
-An illustrative example: like many gender-dysphoric males, I cosplay female characters at conventions sometimes. And, unfortunately, like many gender-dysphoric males, I'm _not very good at it_. I think someone looking at my cosplay photos and trying to describe their content in clear language—not trying to be nice to anyone or make a point, but just trying to use language as a map that reflects the territory—would say something like, "This is a photo of a man and he's wearing a dress." The word *man* in that sentence is expressing *cognitive work*: it's a summary of the [lawful cause-and-effect evidential entanglement](https://www.lesswrong.com/posts/6s3xABaXKPdFwA3FS/what-is-evidence) whereby the photons reflecting off the photograph are correlated with photons reflecting off my body at the time the photo was taken, which are correlated with my externally-observable secondary sex characteristics (facial structure, beard shadow, *&c.*), from which evidence an agent using an [efficient naïve-Bayes-like model](http://lesswrong.com/lw/o8/conditional_independence_and_naive_bayes/) can assign me to its "man" category and thereby make probabilistic predictions about some of my traits that aren't directly observable from the photo, and achieve a better [score on those predictions](http://yudkowsky.net/rational/technical/) than if the agent had assigned me to its "woman" category, where by "traits" I mean not *just* chromosomes ([as you suggested on Twitter](https://twitter.com/ESYudkowsky/status/1067291243728650243)), but the *conjunction* of chromosomes *and* reproductive organs _and_ muscle mass (sex difference effect size of [Cohen's *d*](https://en.wikipedia.org/wiki/Effect_size#Cohen's_d)≈2.6) *and* Big Five Agreeableness (*d*≈0.5) *and* Big Five Neuroticism (*d*≈0.4) *and* short-term memory (*d*≈0.2, favoring women) *and* white-to-gray-matter ratios in the brain *and* probable socialization history *and* [lots of other things](https://en.wikipedia.org/wiki/Sex_differences_in_human_physiology)—including differences we might not necessarily currently know about, but have prior reasons to suspect exist: no one _knew_ about sex chromosomes before 1905, but given all the other systematic differences between women and men, it would have been a reasonable guess (that turned out to be correct!) to suspect the existence of some sort of molecular mechanism of sex determination.
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+It's true that the same word can be used in many ways depending on context. But you're _not done_ dissolving the question just by making that observation.
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And the one who triumphantly shouts in the public square, "And *therefore*, people who object to my preferred use of language are ontologically confused!" is _ignoring the interesting part of the problem_. Gender identity's [claim to be non-disprovable](https://www.lesswrong.com/posts/fAuWLS7RKWD2npBFR/religion-s-claim-to-be-non-disprovable) mostly functions as a way to [avoid the belief's real weak points](https://www.lesswrong.com/posts/dHQkDNMhj692ayx78/avoiding-your-belief-s-real-weak-points).
-Making someone say "trans woman" instead of "man" in that sentence depending on my verbally self-reported self-identity may not be forcing them to *lie*. But it *is* forcing them to obfuscate the probabilistic inference they were trying to communicate with the original sentence (about modeling the person in the photograph as being sampled from the "men" [cluster in configuration space](https://www.lesswrong.com/posts/WBw8dDkAWohFjWQSk/the-cluster-structure-of-thingspace)), and instead use language that suggests a different cluster-structure ("trans women", two words, are presumably a subcluster within the "women" cluster). This encoding might not confuse a well-designed AI into making any bad predictions, but [as you explained very clearly, it probably will confuse humans](https://www.lesswrong.com/posts/veN86cBhoe7mBxXLk/categorizing-has-consequences):
+This encoding might not confuse a well-designed AI into making any bad predictions, but [as you explained very clearly, it probably will confuse humans](https://www.lesswrong.com/posts/veN86cBhoe7mBxXLk/categorizing-has-consequences):
> You can see this in terms of similarity clusters: once you draw a boundary around a group, the mind starts trying to harvest similarities from the group. And unfortunately the human pattern-detectors seem to operate in such overdrive that we see patterns whether they're there or not; a weakly negative correlation can be mistaken for a strong positive one with a bit of selective memory.
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(I _want_ to confidently predict that everything I've just said is completely obvious to you, because I learned it all specifically from you! A 130 IQ _nobody_ like me shouldn't have to say _any_ of this to the _author_ of "A Human's Guide to Words"! But then I don't know how to reconcile that with your recent public statement about [not seeing "how there's scientific truth at stake"](https://twitter.com/ESYudkowsky/status/1067482047126495232). Hence this desperate and [_confused_](https://www.lesswrong.com/posts/5JDkW4MYXit2CquLs/your-strength-as-a-rationalist) email plea.)
In your email of 29 November, you wrote, "I hope I would have noticed if I had tweeted anything asserting [Zack's] factual statements to be factually false, since that would imply knowledge I don't claim to have," and in your Twitter [reply link](https://twitter.com/ESYudkowsky/status/1068071036732694529) to my post (thanks!!), you wrote, "[w]ithout yet judging its empirical content." However, as Michael emphasized ("That's not what Zach is talking about at all and not what the debate is about and you know this"), the _main_ point I'm trying to make is a philosophical one, not an empirical one: that category boundaries and associated language are not arbitrary (if you care about human intelligence being useful), and that sex (or "gender") is no exception.