What claims were fabricated, specifically? It seems like mostly minor stuff. As in, a man with visual agnosia probably did mistake very different objects, like his wife or his hat, though maybe Sacks created that specific situation where he mistook his wife for his hat just for dramatic effect. It's shitty that he would do that, but I still feel that whatever I believed after reading The Man Who Mistook His Wife for a Hat I was probably right to believe, because the major details are probably true?
I think that the case of twins who generated prime numbers is a serious one. This leads us to overestimation of human brain capabilities. I used to be skeptical about it and was criticize for not believing.
I think that we may be tempted to justify our adherence to Sacks's narrative by nice arguments like his reading feels honest and convincing. However it is plausibility a rationalization avoiding to acknowledge much more common and boring reasons such as we have a strong prior because 1) it's a book 2) it's a best seller 3) the author is a physician 4) the patients were supposed to be known to other physicians, nurses, etc 5) and yes, as you also pointed out, we already know that neurology is about crazy things. So overall the prior is high that the book tells the truth even before we open it. That's said, I really love Oliver Sacks's books.
I was under the impression that Oliver Sacks was well regarded among his professional colleagues, so he wouldn't just make up a bunch of important stuff out of whole cloth.
I have read about people who were skeptical of the substance of the Phineas Gage story too (i.e. that he had this big involuntary personality shift after his injury.)
I thought the cases in The Man Who Mistook His Wife for a Hat were obviously as fictionalized as an episode of House: the condition described is real and based on an actual case, but the details were made up to make the story engaging. But I didn't read it in 1985 when it was published. Did people back then take statements like "based on a true story" more seriously?
So, it's recently come out that Oliver Sacks made up a lot the stuff he wrote.
I read parts of The Man Who Mistook His Wife for a Hat a few years ago and read Musicophilia and Hallucinations earlier this year. I think I'm generally a skeptical person, one who is not afraid to say "I don't believe this thing that is being presented to me as true." Indeed, I find myself saying that sentence somewhat regularly when presented with incredible information. But for some reason I didn't ask myself if what I was reading was true when reading Oliver Sacks. Why was this?
The main reason I can think of is that the particular domain of Sacks, which I'd call neurology or the behavior of brain damaged patients, is one in which I had prior belief that A. incredible stuff does happen and B. we don't really understand. In particular, we have stuff like the behavior of split hemisphere patients and people like Phineas Gage. So my prior is that incredible things really do happen, and nothing Sacks said was any more unbelievable than these phenomena.
Also, for Musicophilia, the "domain" could additionally said to be music or humans' reactions to music, which again is something I think is pretty incredible and that we don't understand. Like, music is really powerful, why do we have such strong reactions to it? Why does it exist at all? Let me put it this way: music is so weird that if I hadn't experienced its effects first hand, I'd be inclined to think that the entire thing is "made up" and humanity is under some sort of mass delusion, confusion, or fraud.
The second reason I can think of is that something... the approach or voice or worldview or something else... about Oliver Sacks made me trust him; made me think he was generally sane and truthseeking and honest. I'm not entirely sure why this is. I'll be thinking about this more.
If you were like me and you were insufficiently skeptical of Oliver Sack's claims, it's worth asking: why did I make this mistake? Certainly this thing is relevant to the general rationalist project, to the goal of being less wrong. Or maybe you weren't like me, and you didn't believe Sacks. Well, why not? Don't just say "This isn't actually hard," because this is actually hard. Epistemics is hard! Under what principles or knowledge of the world did you not believe Sacks while also believing that split brain patients were a thing?