You see a qualified medical doctor and an unqualified physical health promoter present on the benefits of living a healthy lifestyle. Both are very convincing, although their arguments differ slightly. Knowing what you do about the importance of source credibility, you obviously tend to believe the arguments of the medical doctor rather than the health promoter. However, after about a year you find yourself talking to a friend about why they should be living a healthier lifestyle, and without realising it you are forcefully putting forward the arguments of both the medical doctor and the health promoter you saw present a year earlier. This is an example of:

Question

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The sleeper effect is a phenomenon where messages from less credible sources increase in persuasiveness over time, as the source's credibility fades from memory while the message itself is retained. In this scenario, despite initially favoring the medical doctor's advice due to their credibility, over time, the arguments from both the doctor and the less credible health promoter have merged in your memory, leading you to advocate for a healthier lifestyle using points from both sources.

You See a Qualified Medical Doctor and an Unqualified Physical