Object identification in perceptual tests may include constituents of mental rotation. A matching-to-sample task was conducted with same or different objects to look for evidence of rotation. Elementary schoolchildren (6 to 8 years old) in Grades 1 to 4 (N = 264) participated, using the inclined Flags Test and the Water Level Test to ensure that children can use kinematic imagery for the Flags Test even if they used static imagery for the Water Level Test. Performance on the inclined Flags Test varied by age group. Use of implicit mental rotation of the inclined object was inferred in recognition. Also, children at the pre-operational stage showed a rotational effect, i.e., they could transform the object by turning it, thereby confirming kinematic imagery is used from age 6. As a consequence, solving both rotation tasks may require not only recognition of object frames but also objects internal to the frame.
This study aims to examine the developmental changes in young children's perception. A matching completion task consisting of three geometric figures and one bird-like figure were completed by children 3-5 years of age (N ¼ 99). The rotation effect, in which the correct response decreased with orientation (45 , 90 135 , and 180 ), was confirmed, except in one of the geometric conditions. We found that two factors were needed for a child to perform the bird-like completion task: clarification of the reference to each stimulus and awareness of the turning orientation. These studies suggest that the children processed the contour and feature information individually, and that the contour information was processed earlier than the feature information. We derived three criteria for sensitive information to resolve the task, contact, contour, and left-right. Findings are discussed with regard to the reference action and the part-whole relationship.
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