Abstract
Olum discovered that seven-year-old children give unusual responses to observed movement, presented on a Michotte apparatus, in contrast to that of adults. We made the following changes in Olum's procedures: (a) stimuli were presented without repetition, (b) neutral instructions were used, (c) different and more complicated stimuli were used, (d) 20 seven-year-old and 20 ten-year-old children were used. The unusual responses remained. They cannot be explained as an effect of repetition, particular stimuli, or procedure. The younger children's responses were less accurate and more variable. This accords with Piaget's perceptual theory, as it relates to stages of cognitive development.

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