SUBJ1

I'm talking about the effect of environment on the brain. How, for example, through one's environment one may come to believe that we are gene-propagation machines and go on to use this as a basis for an ethical principle that would forbid us from promoting voluntary eugenics on the grounds that it restricts the normal/natural functions of the body and mind.

Not sure how that qualifies as "chemistry."

I'm of the opinion that what enters the brain, via the senses, causes physical changes in the brain. For example, memories and perceptions. Memories would seem to be stored in electro-chemical form.