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Mental rotation in human infants: a sex difference
David S Moore1, Scott P Johnson
1Pitzer College and Claremont Graduate University, Los Angeles, CA 91711,USA. dmoore@pitzer.edu
Psychological Science
|December 17, 2008
Summary
Male infants show early signs of mental rotation, a spatial reasoning skill. This sex difference in 3D object manipulation was observed in 5-month-olds, unlike in younger children.
Area of Science:
- Developmental Psychology
- Cognitive Neuroscience
- Human Infant Studies
Background:
- Sex differences in mental rotation tasks are well-documented in adults.
- Previous research has not identified these differences in infants under 4 years of age.
Purpose of the Study:
- To investigate the presence of mental rotation abilities in human infants.
- To determine if sex differences in mental rotation emerge in early infancy.
Main Methods:
- Habituation of 5-month-old infants to a revolving object (240 degrees).
- Testing with novel perspectives (120 degrees) of the familiar object and its mirror image.
- Observing infant responses to assess recognition and spatial reasoning.
Main Results:
- Male infants demonstrated recognition of the familiar object from a new perspective.
- This recognition suggests the ability to mentally rotate the object in 3D space.
- Female infants did not show the same recognition, indicating a potential sex difference.
Conclusions:
- Evidence suggests that sex differences in mental rotation emerge by 5 months of age.
- These findings support the early development of 3D spatial reasoning differences between sexes.
- The study provides the earliest evidence to date of sex differences in mental rotation.
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