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Observer-expectancy effect 0:50
A 50-second explainer of Observer-expectancy effect, narrated over the same demo you can try yourself.
Try the interactive Observer-expectancy effect demo
What this video covers
The observer-expectancy effect occurs when a researcher’s expectations subtly shape a study’s outcome - through how they phrase questions, respond to answers, or interpret behaviour. You might unconsciously steer participants toward agreement or read ambiguous actions in a way that supports your desired result.
As the leading facilitator, you practically handed the participant the answer - "wasn't that easier?" - and of course they agreed. As the neutral one, you asked "how did that feel?" and got the truth, warts and all. Same participant, same task; the only variable was how much of your own hope you let into the room.
