Fig. 1.

Design of the Mnemonic Similarity Task (MST) and pictures examples. First, participants encode a set of pictures. In the second phase (surprise recognition memory test), participants should identify “old”, “new”, or “similar” objects as exactly the same pictures, novel foils, or lures related but not identical to previous pictures, respectively. Mnemonic discrimination performance is measured by the lure discrimination index: the rate of “similar” responses to the lure minus the rate of “similar” responses to the foils. (Pictures are from the MST, freely available at http://faculty.sites.uci.edu/starklab).