Top panel: Example timing and sequence of a trial. Participants study the target item and press a button to initiate the search sequence. At each position they make a decision as to whether the presented item is an exact match to the target item. There are ten stimuli presented sequentially on each trial. Bottom panel: Shows target and the ten stimuli shown during the search sequence of this trial. The stimulus at position eight is the match to the target. Stimuli at positions four, five, and six represent feature overlap levels zero, one, and two, respectively.