In a rct I am conducting I noted that during pre assessment people took the time to fill out the questionnaires, they took there time. During post assessment, the finished the questionnaires in about half of that time. Niw during analyses I note that people tend to fill in the same scores. It appears to me that they are less motived and just go on auto-pilot when filling out the scores.

Does anybody know the exact term for this particular response bias: namely the bias that occurs when people are less motivated to fill out questionnaires and just fill out one particular score for each item.

Thanks

Tom