When we start from the practice applied to human genetics, we realize that embryonic development there are many characteristics and unknown information because they are the mothers who want their embryos to perform experiments, however, we all know that since the beginning of medicine they have carried out abrasive studies that are put into question, from ablations of cerebral lobes, excitation of specific anatomical parts of the nervous system, use of psychoactive or depressants in human beings to approve if they are acts for the consumption of the masses. Unfortunately, we have not yet found an alternative to these orthodox methods and we want to, it provides us with advances in science.
I invite you to see my post, I have one on neurosciences that might interest you.