A system and method is provided for enabling respondents at their computer systems to connect via a browser with a server computer over a network and receive an initial set of survey questions on one or more pages during which primary images are downloaded into the browser's cache but are not presented to each respondent as they are each displayed into a small pixel area on display of the respondent's computer system and thus are not detectable or are not discernable by respondents. The server computer directs the browser of each respondent computer with at least one survey question in which the primary image is displayed from the browser's cache for a brief interval of time to the respondent, and the respondent answers the question with respect to the primary image. After each timed displayed primary image, survey question answer(s) are registered at the server computer.