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gjm comments on Is Spirituality Irrational? - Less Wrong
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That's interesting. Is this "good reasoning" recorded anywhere? I'd love to see it.
Really? What is it?
Before you answer, pay close attention to the wording of my claim: there is no evidence that spiritual experience is anything other than a neurophysiological phenomenon. Such evidence would have to be more than just something that could be caused by a deity, it would have to be something that could not be neurophysiological. And AFAICT, there really is not a single instance of such evidence. If you disagree, please cite the evidence you think exists and we can discuss it.
BTW, this is not an extreme claim. There is zero evidence that quantum mechanics is false. There is zero evidence that general relativity is false. This is so despite the fact that we know that one or the other (possibly both) must in fact be false because they are logically incompatible with each other, so they can't both be true. And it is so despite the fact that the entire physics community is actively looking for such evidence, and that finding it would be considered a major breakthrough. Anyone who finds such evidence will almost certainly win the Nobel prize. Likewise, anyone who had actual evidence of a spiritual phenomenon that could not be (or even had a very low probability of being) neurophysiological will have made a major scientific breakthrough. So the fact that the headlines are not filled with stories of someone being feted for finding this evidence is evidence that such evidence does not exist.
That's wrong. Something that couldn't be neurophysiological would be not merely evidence but proof (not necessarily of a deity, of course, but of some external cause). I suggest that, e.g., Srinivasa Ramanujan's experience of having mathematical insights given to him by the goddess Namagiri was evidence that he was in contact with a supernatural being -- but, of course, far less evidence than it would take to convince me that he really was in contact with such a being.
For A to be evidence of B, all it takes is that A is more likely if B than if not-B. Dreams of goddesses handing out what turn out to be genuine (and highly unusual) mathematical insights are more likely if there are in fact goddesses able to hand out such insights than if there are not, because the existence of such goddesses would provide one more mechanism by which such dreams could occur.
I would suggest that Ramanujan's experiences might be as much as 10:1 evidence for the existence of the goddess Namagiri Thayar. But, of course, every other mathematician who has insights without any sign of gods and goddesses getting involved is evidence against, quite apart from all the other reasons not to believe in Namagiri Thayar or any other goddess.
Perhaps you are using the term "shred of evidence" to denote something more than that. Fair enough, I suppose, but then I'm afraid I think you chose your words badly.
Very well, I concede the point. I should not have said that "there is not a shred of evidence." Still, AFAICT the evidence favors neurobiology by a very substantial margin.