Face stimuli. Seven participants performed the task with morph set 1, and nine performed the task using morph set 2. In the Memory task, the Target face was maintained in WM while faces from the morph set were presented sequentially in pseudorandom order. Participants responded to each face with a Target/non-Target judgment. The Control task required participants to determine whether or not faces were rotated. All faces (except the Novel face, which was not analyzed) contained a percentage of Target facial features (80%, 60%, 40%, and 20%, respectively; see Methods for details).