ABSTRACT
The relationship between psychology and physiology can be approached from several different perspectives, and different words have been used to describe these perspectives. They are psychophysiology, physiological psychology, psycho-neuroimmunology, and neuroscience. Terminology has changed over the years and the term neuroscience has replaced many of the older terms and is sometimes used as a generic term for any relationship between psychology and physiology. There are several arguments against the possibility of reductionism between psychology and physiology, and they fall into two categories. One argument is that although reduction is possible in principle, it will not happen in practice. The other is that reductionism is neither possible in principle nor practice. The chapter examines why reductionism is not possible in principle. There are three linked arguments against reductionism in principle between psychology and physiology: complementarity, functional versus structural description, and emergentism.
