Miller and Weiss's cross-sectional experiment with children of ages seven, 10, and 13 assessed selective attention. When the oldest children recalled fewer irrelevant details from the scenes, this result showed that

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The result of the oldest children recalling fewer irrelevant details from the scenes indicates that they were better able to ignore irrelevant details. This suggests that they had developed better selective attention abilities, which is a cognitive skill that develops over time. It does not necessarily mean that they were expending less effort or that gender mattered in this case. There is also no evidence to support the idea that the younger children were less intelligent.

Miller and Weiss's Cross-Sectional Experiment with Children of Ages Seven