Those electochemical processes could be a result of the soul transgressing the mind....
Being able to describe things physically does not negate a possible non-physical element uderlying those physcal processes.
So, given that human brains, chimpanzee brains, lemur brains, and naked mole-rat brains all function physically and electrochemically in very much the same fashion, are you willing to extend the concept of a "soul" to those critters, too? If not, why not? Is there some requirement that
your prefrontal cortex must be this big before you get ensouled? If so, where does that leave two-pound preemie babies?