Lasso of Truth period before, during and after World War I, on understanding and perfecting the systolic blood-pressure test while working on his Ph.D. in psychology at Harvard University. Blood pressure was one of several elements measured in the polygraph tests that were being perfected since as far back as Italian criminologist Cesare Lombroso, in 1895. Marston's wife, psychologist and lawyer Elizabeth Holloway Marston, one of his inspirations for the Wonder Woman character, also played a key role in his lie detector research. But the lie detector had nothing to do with Marston's creation of the Magic Lasso. Wonder Woman's "Magic Lasso" or
William Moulton Marston of the polygraph, when he subsequently embarked on a career in entertainment and comic book writing and appeared as a salesman in ads for Gillette Razors, using a polygraph motif. From his psychological work, Marston became convinced that women were more honest than men in certain situations and could work faster and more accurately. During his lifetime, Marston championed the latent abilities and causes of the women of his day. Marston was also a writer of essays in popular psychology. In 1928, he published "Emotions of Normal People," which elaborated the DISC Theory. Marston viewed people behaving along two axes,