Who was the American philosopher who authored a textbook in 1890 for the emerging discipline of psychology?

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The American philosopher who authored a textbook in 1890 for the emerging discipline of psychology was William James. His book, "The Principles of Psychology," is considered a seminal work in the field and helped establish psychology as a legitimate area of study. Wundt and Freud were influential psychologists during this time, but they did not author textbooks for the emerging discipline of psychology. Watson was a behaviorist who came after James and did not author a textbook in 1890.

Who Was the American Philosopher Who Authored a Textbook in 1890