Earlier quoted context omitted.
What's the argument that understanding neurons is necessary? Perhaps intelligence is like a black box input to our bodies (call it the "soul", even though this isn't testable and therefore not a hypothesis). The mind therefore wouldn't play any more of a role in intelligence than the eye. And I'm not sure people would say the eye is necessary for understanding intelligence. Now, I'm not really in a position to argue…
Brain damage by physical trauma, disease, oxygen deprivation, etc. has dramatic and often permanent effects on the mind. The effect of drugs (including alcohol) on the mind. Of note is anesthesia which can reliably and reversibly stop internal experience in the mind. For a non-physical soul to hold our mind we would expect significant divergence from the above. Out of body experiences and similar are indistinguishabl…
That's not a completely watertight argument.
Consider a traditional FM/AM radio. You can modify it, damage it, and get notable changes to its behaviour...
> Of note is anesthesia which can reliably and reversibly stop internal experience in the mind
...turn it off and on again...
> For a non-physical soul to hold our mind we would expect significant divergence from the above.
... yet concluding that all the noises produced from the radio are purely internal, mechanical and physical would be the wrong conclusion.
(I'm not arguing that the human brain/mind is anything like analogous to a radio, just pointing out the limits of this approach.)