relationship between philosophy and psychology

The order for the three majors is sociology, psychology, and lastly philosophy.

Psychology is divided into more parts than philosophy. (Originally was psychology a part of philosophy however. See for example Mind-Body problem.)

Terence Horgan has written:

'Making Materialism'

'Connectionism and the philosophy of psychology' -- subject(s): Connectionism, Cognition, Philosophy of mind, Psychology and philosophy

The parent disciplines of psychology include philosophy, physiology, and biology. Philosophy provided the framework for understanding the mind, physiology contributed to the understanding of the brain and nervous system's role in behavior, and biology influenced the study of genetics and evolution in psychology.