The situation is: Sometimes we ask a subject to answer a same question many times in a questionnaire. It creates the effect that the respondent can guess what is the intention of the survey and somehow she/he will manipulate the answer to please or against the investigator.
For example, ask a subject to rate each of 10 images for a same question (Likert scale): How much do u like this image? It creates the effect that subject can easily know the intention after answering a few ratings.
Any techniques to avoid this effect?
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