Mean Reaction Times (RTs) in milliseconds (ms) to locate a discrepant target (bird) in the different type of distractor conditions (snake, spider, mushroom, and no distractor), in Experiment 2.

<p>The upper panel refers to the homogeneous displays, whereas the lower panel illustrates the heterogeneous displays, both as a function of the set size (4; 6). Longer RTs indicate larger interference scores.