Which 1920s advertising innovation first systematically applied psychology to persuade consumers, establishing the concept of 'brand personality'?

The early 20th century saw revolutionary changes in advertising techniques that continue to influence marketing today. Companies began to understand the power of psychology and emotional appeal in their campaigns. This poll explores one of the most significant historical innovations in advertising that changed how products were marketed forever. Test your knowledge about this pivotal moment in advertising history!

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JWT's 'Testimonial' campaigns featuring celebrities
Edward Bernays' 'Torches of Freedom' campaign linking cigarettes to women's liberation
Armstrong Cork Company's 'narrative storytelling' radio advertisements
Sears Roebuck's 'scientific selling' mail-order catalog strategy