A medical doctorate graduate (M.D.) who has taken a few years of postdoctoral internship to study brain disorders becomes a psychiatrist. The psychiatric model of treatment is to “solve” the patients’ problems with medications.
A psychologist (Ph.D.) has studied the science of psychology for 10 years. Psychologists study human behavior, motivation and possibly modification. In an institutional setting they usually do testing and results. The client patient approach involves talking and asking the right questions so the patient can clarify their perspective.
The problem with both of these fields is they define aberrant patterns of behavior. There is no pattern definition for “normal” behavior that has become accepted in mainstream “therapy”. Narayan Singh Khalsa, Ph.D. has written such books defining personal programming that develops the personality in a normal or abnormal way.