To test the development of these major cognitive skills with children 3 ½ to 7 years of
age, some tasks have been developed requiring them to hold two rules in mind (WM) and
suppress a dominant response (inhibition). One example is the Day/Night Stroop task, which is
similar to the adult Stroop task. This task was designed for younger children; the child is
required to say “day” when shown a card with a moon, and say “night” when shown a card with
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a sun. This is extremely difficult for the 3 ½ -year-old, but much easier for the 6 or 7-year-old
(Diamond, et al., 2002; Diamond & Taylor, 1996).