Figure 3.

Examples of two trials from the repeated condition of test I and two trials from the trial-unique condition of test I. In both conditions, two images appeared at the top of the display and an intermediate image appeared at the bottom. Note that in the two trials illustrated for the repeated condition, the two top images are identical. In this condition, the same pair of top images was used across 90 trials and an intermediate image from the same morph series appeared at the bottom (i.e., all the displays in a 90-trial block consisted of images from the same morph series). In the two trials illustrated for the trial-unique condition, the two top images are different. In this condition, the images presented in every trial came from a different morph series and each display was presented only once. Thus, each display was unique for every trial. *, Correct choice.