In this task, children were required to scan a display to determine whether or not a target stimulus was present. There were two conditions corresponding to feature search (first 24 trials) and conjunction search (last 24 trials). In feature search, children needed to attend to one feature of the target (green triangle) to identify it among distractors that differed only on that feature (yellow triangles). In conjunction search, two features were required to define the target (turquoise circle) among distractors that shared one of these two features (turquoise squares and pink circles). Conjunction search is considered to require more EC than feature search, and so better performance on that condition may reflect better EC (Hommel, Li, & Li, 2004). The distractor set size on each trial was small (0 or 5 distractors) or large (15 or 25 distractors). The task was administered on a computer, and children responded by pressing the number key ‘‘1” (target present) or ‘‘0” (target absent). Children were instructed to respond as quickly as possible without making errors. Performance was analyzed using measures of accuracy (percentage correct) and speed of processing (reaction time).