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William James was a northamerican phisician and philosopher who lived between the middle of the 19^th century and the beginning of the last century. His work was very important for our disipline and, even today, some of his theories are matter of discussion and references for the psychologists.

In psychology he started a way of thought about psychological phenomena called functionalism and in the field of philosophy he was a pragmatic philosopher who wrote several works about this subject.

He wrote a theory about emotions, called today James-Lange theory of emotion which basically suggests that before the experience of any emotion arises the phisiological pattern of activation in the nervous system.

I think that maybe the theories of James are not right, but the importance of this man is that he has set several importants topics for psychology. In this sense, we can say that James is a classic thinker in our science.