Which psychological principle, first applied to advertising in the 1920s, revolutionized product marketing by shifting focus from product features to emotional benefits?

The world of advertising has been transformed by groundbreaking innovations and psychological insights. Some advertising techniques have literally changed the course of marketing history. Test your knowledge about a pivotal moment that revolutionized how companies connect products with consumers. This question explores how scientific understanding of human behavior dramatically altered advertising strategies.

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Classical conditioning (associating products with positive emotional responses)
Cognitive dissonance theory (creating psychological tension resolved by purchase)
Maslow's hierarchy of needs (targeting specific levels of human motivation)
Social proof principle (showing others using and approving products)