Within the study and practice of psychology, what ethical issues must be considered and protected?

As with
all areas of medicine, psychologists accept and endorse a set of standards, including ethical
guidelines, that are designed at least in part to protect the interests of the patient or of the
research subject. 

The first and foremost ethical or moral standard under
which psychologists, as with all other practitioners of medicine, abide is encompassed in the
Latin phrase "primum non nocere," which translates as
"first, do no harm,"  which was derived from the Hippocratic Oath ("...I will do
no harm or injustice...").  

Psychologists conducting research on
living subjects have a moral obligation to protect those subjects from harm.  When studying the
effects of external stimuli on research subjects, for...