By the 1920s, psychology was emerging as a science with broad popular appeal, finding outlets in many channels including magazines and the movies, and being called upon to explain many things including delinquency, the economy and fashion.
The International Library of Psychology, Philosophy and Scientific Method, under the general editorship of C K Ogden at Magladene College, Cambridge, published on a wide range of topics including Educational Psychology (Fox, Piaget), anthropology, classical philosophy, neurobiology and colour theory.
William Moulton Marston, inventor of the Lie Detector, DISC personality testing and Wonder Woman, published his book The Emotions of Normal People in this series, and on the basis of this publication and the Embassy Theater Test, enjoyed a short career as a consultant psychologist to Universal Studios.
Hollywood was at the time taken up with the problem of sociological studies of the impact of motion pictures on delinquent youth and other vulnerable groups, that was threatening to become a cost problem. Its recruitment and popularisation of psychology in the 1920s was part of an effort to appear to take this seriously, under the stewardship of William Hays.
By the 1950s, the popularity of psychology was entrenched in women's magazines and other popular cultural channels, and psychologists themselves had become staple characters in movies--not always in a good way.