Abstract
This study compared Marmor's state-comparison mental rotation task and a movement recognition task with respect to the level of sequence knowledge required for correct performance. The movement recognition task assessed children's understanding that pivot position and the shape of a rotating object remain invariant throughout the movement. Based on an analysis of development in children's counting, we hypothesized that explicit knowledge of sequence relations is not needed on the state-comparison task but is needed on the pivot and shape recognition task. In Experiment 1, 5- and 7-year-old children performed on the state-comparison task and an ordering task involving a Mickey Mouse figure. In Experiment 2, children between the ages of 5 and 13 years performed on a pivot and shape recognition task and an ordering task involving rotating squares. As predicted, the results indicated that 5-year-olds can execute a mental rotation on the state-comparison task but cannot sequence states in the rotation movement, whereas sequencing was a prerequisite for identification of incorrect movement sequences on the recognition task. The implications of these findings for development in children's kinetic imagery were discussed.
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