Rapid Serial Visual Presentation (RSVP) is a technique that allows images to be presented sequentially in the time-domain, thereby offering an alternative to the conventional concurrent display of images in the space domain. Such an alternative offers potential advantages where display area is at a premium. However, notwithstanding the flexibility to employ either or both domains for presentation purposes, little is known about the alternatives suited to specific tasks undertaken by a user. As a consequence there is a pressing need to provide guidance for the interaction designer faced with these alternatives. We investigated the task of identifying the presence or absence of a previously viewed image within a collection of images, a requirement of many real activities. In experiments with subjects, the collection of images was presented in three modes (1) 'slide show' RSVP mode; (2) concurrently and statically