<Tr> <Th> Media type </Th> <Td> Print (Hardcover and Paperback) </Td> </Tr> <Tr> <Th> Pages </Th> <Td> xviii, 1393 </Td> </Tr> <P> The Principles of Psychology is an 1890 book about psychology by William James, an American philosopher and psychologist who trained to be a physician before going into psychology . There are four methods from James' book: stream of consciousness (James' most famous psychological metaphor); emotion (later known as the James--Lange theory); habit (human habits are constantly formed to achieve certain results); and will (through James' personal experiences in life). </P> <P> The openings of The Principles of Psychology presented what was known at the time of writing about the localization of functions in the brain: how each sense seemed to have a neural center to which it reported and how varied bodily motions have their sources in other centers . </P>

Who wrote the early textbook principles of psychology