Two experiments, one involving walking, the other throwing, were conducted with boys 8, 12, and 16 yr. of age. The tasks involved viewing a distance to walk or throw, and then having to remember that distance before acting. The slow walking task showed no age effects; viewing and delay variables were constant across ages. The throwing task showed 16-yr.-olds to be superior to the other two age groups; different viewing and delay times had little effect on this older group. The 8- and 12-yr.-olds were affected by the viewing and delay conditions. The results are discussed with respect to task selection for developmental research.
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