As much as I love bashing the guy who's making outrageous claims I don't understand what's going on. At no point does he claim there's a chemical analysis of the brain done, asking him how it is done is a strange way to retaliate.

Providing your own proof that chemical analysis of the brain IS done would be a better response. As it reinforces that he is incorrect. But asking him how chemical analysis is done is like asking the pope how the big bang occured or asking an atheist how the ark was made. It was never supported by them to begin with, so the only way leeway can be made is proving for your own purpose how it is done.

Of course there is every chance that I'm not fully understanding what you mean by your original comment. Am I missing something?