Which revolutionary advertising technique of the 1920s marked the first systematic attempt to use psychology to influence consumer behavior?

Before digital marketing and social media, advertising underwent dramatic transformations throughout history. The techniques that worked in different eras tell us fascinating stories about both consumer psychology and technological innovation. This trivia question explores a pivotal moment when advertising techniques fundamentally changed how products reached consumers, creating ripple effects we still see in modern marketing approaches.

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Edward Bernays' 'engineering of consent' campaigns that linked products to unconscious desires rather than practical benefits
P.T. Barnum's celebrity endorsement strategy featuring notable historical figures in newspaper advertisements
Montgomery Ward's data-driven direct mail catalogs that targeted specific demographic segments
The Sears Roebuck 'emotional storytelling' radio dramas that incorporated subtle product placements