The sleeper effect is a manipulation technique that is commonly employed by the mainstream media, whether its for politics, advertisements, or whatever. Learn more here:
Sources:
Communication and Persuasion
https://www.researchgate.net/publication/308113993_Communication_and_Persuasion_von_Carl_I_Hovland_Irving_L_Janis_und_Harold_H_Kelley_1953
The Influence of Source Credibility on Communication Effectiveness
https://academic.oup.com/poq/article-abstract/15/4/635/1923117
Experiments on Mass Communication
https://psycnet.apa.org/record/1950-00627-000
Empirical Tests of the Absolute Sleeper Effect
http://people.oregonstate.edu/~flayb/MY%20PUBLICATIONS/Theory/Gruder%20et%20al%2078%20Sleeper%20effect.pdf
The Sleeper Effect in Persuasion
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3100161/
Sleeper Effect
https://psychology.iresearchnet.com/social-psychology/social-influence/sleeper-effect/
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