Defination of psychology

Exploring Pyschology 6th edition is writtern by an American educationer.

So the defination is accroding to the orientation of the American's river.

It begins with the mental things to the 50's behaviorism

then it go back to the inner state and the external aspect is treated as

less important.

So the defination of the psychology is the preveous:

The science of behavior and mental processes.