**Subjects** 6 for piloting stage <br> 24 for main experiment <br> Subjects will be drawn from the undergraduate course credit pool. They will participate in groups of no larger than five at testing computers separated by dividers on either side. View distance is fixed with an adjustable, custom chin rest constructed from PVC pipe and foam padding. **Stimuli** Massive Memory Database [1][2], augmented with images from Google images. All test and bait images are members of an exemplar pair; filler images are randomly drawn without replacement from the unique object set. **Display Parameters** View distance: 55 cm <br> Image size: 256 x 256 (8.5 degrees visual angle) <br> Monitor: BenQ XL2420TX (1920 x 1080 at 99.9 Hz) <br> **Task Description** Study task: 240 images, each a member of an exemplar pair<br> View time: 3 seconds <br> Presentation: at fixation <br> A break screen occurs halfway through the study phase, pausing until subjects initiate the second half of the study phase. Change blindness (studied): 80 trials. First array is five random filler objects. Bait object is an exemplar pair that changes into the studied exemplar in the second array. <br> View time: 1.2 s (200ms per prechange item) <br> Presentation: equally spaced on an annulus at 12.6 degrees eccentricity <br> Response mode: Click changed object Change blindness (unstudied): 80 trials. First array is five random filler objects and a bait item from an unstudied exemplar pair. Bait item changes into its unstudied complement. <br> View time: 1.2 s (200ms per prechange item) <br> Presentation: equally spaced on an annulus at 12.6 degrees eccentricity <br> Response mode: Click changed object Memory test (6AFC): 80 trials. Array of five random filler objects and one studied exemplar.<br> View time: unlimited <br> Presentation: equally spaced on an annulus at 12.6 degrees eccentricity <br> Response mode: Click familiar item Memory test (2AFC): 80 trials. Studied exemplar presented with its unstudied complement as a foil. <br> View time: unlimited <br> Presentation: Presented side-by-side at 15.8 degrees eccentricity <br> Response mode: Arrow keys indicate studied item **Data** All data saved on each trial. Percent accuracy on the four response tasks is the measure of interest. **References** <br> [1]: http://cvcl.mit.edu/MM/stimuli.html <br> [2]: Brady, T.F., Konkle, T., Alvarez, G.A., & Oliva, A. (2008). Visual long-term memory has a massive storage capacity for object details. *Proceedings of the National Academy of Sciences,105* (38), 14325-1432.