Scientifically nothing follows from, is predicted by, or is falsifiable on the basis of postulating a soul. However, this notion does not exclude a belief in God or that one cannot believe in a god or gods. The assertion is that we cannot explain behavior on the basis of religious belief. Religious beliefs are intrinsically not falsifiable, whereas psychology is a science. Scientific assertions rely upon their ability to be proven objectively, whereas religious assertions rely upon faith and hence are not provable objectively.
Psychology is defined as the scientific study of the behavior of organisms.
A psychologist studies and creates an account which can be translated into testable hypotheses about the structure of human behavior. Descartes provided some key ideas. In particular he proposed that there were three basic functions of the nervous system. In looking at the pattern of events in the nervous system, we should clearly distinguish between afferent neurons and efferent neurons . Afferent neurons transmit signals into the system, and efferent neurons send signals out of the system.