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RobertWiblin comments on Effective Altruism Through Advertising Vegetarianism? - Less Wrong
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I think some weighting for the sophistication of a brain is appropriate, but I think the weighting should be sub-linear w.r.t. the number of neurones; I expect that in simpler organisms, a larger share of the brain will be dedicated to processing sensory data and generating experiences. I would love someone to look into this to check if I'm right.
I agree on that effect, I left out various complications. A flip side to that would be the number of cortex neurons (and equivalents). These decrease rapidly in simpler nervous systems.
We don't object nearly as much to our own pains that we are not conscious of and don't notice or know about, so weighting by consciousness of pain, rather than pain/nociception itself, is a possibility ( I think that Brian Tomasik is into this).