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Physiological psychology, on the other hand, is competent to investigate the relations that hold between the processes of the physical and those of the mental life.

The attitude of physiological psychology to sensations and feelings, considered as psychical elements, is, naturally, the attitude of psychology at large.

Physiological psychology is, therefore, first of all psychology.

Physiology and psychology cover, between them, the field of vital phenomena; they deal with the facts of life at large, and in particular with the facts of human life.

Psychology is the science of the act of experiencing, and deals with the whole system of such acts as they make up mental life.

Physiology is concerned with all those phenomena of life that present them selves to us in sense perception as bodily processes, and accordingly form part of that total environment which we name the external world.

Psychology is the science of the intellects, characters and behavior of animals including man.

There are no clear boundary lines between what is physiological, what is psychological, and what is spiritual. Those are language domains that make sense and have integrity but overlap significantly.

I was interested in the nature of human mental processes, which is what got me interested in psychoanalysis. And it became clear to me after a while that mental processes come from the brain, and in order to understand them, you need to be a biologist of the brain.