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Using the axis of elongation to align shapes: Developmental changes between 18 and 24 months

Identifieur interne : 000C97 ( Main/Curation ); précédent : 000C96; suivant : 000C98

Using the axis of elongation to align shapes: Developmental changes between 18 and 24 months

Auteurs : Linda B. Smith ; Sandra Street ; Susan S. Jones ; Karin H. James

Source :

RBID : PMC:4030647

Abstract

An object’s axis of elongation serves as an important frame of reference for forming 3-dimensional representations of object shape. By several recent accounts, the formation of these representations is also related to experiences of acting on objects. Four experiments examined 18- to 24-month-old (N = 103) infants’ sensitivity to the elongated axis in action tasks that required extracting, comparing and physically rotating an object so that its major axis was aligned with that of a visual standard. In Experiments 1 and 2, the older infants precisely rotated both simple and complexly shaped 3-dimensional objects in insertion tasks in which the visual standard was the rectangular contour defining the opening in a box. The younger infants performed poorly. Experiments 3 and 4 provide evidence on emerging abilities in extracting and using the most extended axis as a frame of reference for shape comparison. Experiment 3 showed that 18 month olds could rotate an object to align its major axis to the direction of their own hand motion and Experiment 4 showed that they could align the major axis of one object to that of another object of the exact same 3-dimensional shape. The results are discussed in terms of theories of the development of 3-dimensional shape representations, visual object recognition, and the role of action in these developments.


Url:
DOI: 10.1016/j.jecp.2014.01.009
PubMed: 24650776
PubMed Central: 4030647

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PMC:4030647

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