noun
sleeper effect; delayed effect of advertising
A psychological phenomenon where a message from a low-credibility source becomes more persuasive over time. Used in advertising and communication studies.
スリーパーエフェクトは、信頼性の低い情報源からのメッセージでも時間が経つと説得力が増す現象です。
The sleeper effect is a phenomenon where a message from a low-credibility source becomes more persuasive over time.
Variant with interpunct; less common in running text.
Borrowed from English 'sleeper effect'.