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The original researchers coded the procedures using PsychToolBox for Matlab, which was unavailable to the replication researchers. PsychoPy (http://www.psychopy.org) was used to implement the presentation of the stimuli with the same timing intervals, stimulus size, and trial numbers. Method The sequential response task required participants to make separate comparisons between the top and bottom of the study face and a single test face. The test face was presented with a square bracket above the top or below the bottom to cue the participant to which half to compare to the study face. There were 16 practice trials, 720 test trials, and four study-test comparisons in which the top and bottom of the test face was either 1) same top, same bottom, 2) same top, different bottom, 3) different top, same bottom, or 4) different top, different bottom. Within each of these response types, 60 test trials were presented with the face aligned, 60 test trials were presented with the face misaligned such that the bottom half was moved to the left and the top was moved to the right so that the midpoint of the bottom was aligned with the left edge of the top face, and 60 test trials were presented with the face very misaligned such that the bottom half was moved to the left and the top was moved to the right so that the right edge of the bottom was aligned with the left edge of the top. The presentation of test faces as aligned, misaligned, or very misaligned trials was randomized for each participant. All study faces were presented aligned. The cue for the test face, top or bottom, was randomized and 50% of the time the top half was cued first and 50% of the time the bottom half was cued first. Each trial began with a 500-ms fixation cross that preceded a 400-ms presentation of the study face. A random pattern mask stimulus then appeared for 2000-ms before the test face. The top or bottom cue for test face, a square bracket, appeared simultaneously with the presentation of the test face. Participants were given a maximum of 2500-ms to provide an answer for the cue. After an answer was provided, or the maximum time was reached, the other part of the test face was cued and participants were given a maximum of 2500-ms to respond. Responses indicating that the cued half of the test face and study face were the same were made using the left hand and responses indicating that they were different were made using the right hand.
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