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When do infants expect hands to be connected to a person?
Virginia Slaughter1, Michelle Heron-Delaney
1Early Cognitive Development Unit, School of Psychology, University of Queensland, Brisbane QLD 4072, Australia. vps@psy.uq.edu.au
Journal of Experimental Child Psychology
|September 25, 2010
Summary
Infants learn that hands belong to people between 6 and 9 months old. This study used a violation-of-expectation paradigm to track infant looking times and understand person perception development.
Area of Science:
- Developmental psychology
- Cognitive science
- Infant perception
Background:
- Understanding how infants form object and person representations is crucial for cognitive development research.
- Early research suggests infants can recognize faces and bodies, but the role of specific body parts, like hands, is less understood.
Purpose of the Study:
- To investigate whether infants infer the presence of a person based solely on the visual information of hands.
- To determine the developmental timeline for infants associating hands with a whole person.
Main Methods:
- A violation-of-expectation paradigm was employed.
- Infants were familiarized with hands interacting with an object, followed by the reveal of either a person or a mannequin.
- Infant looking times were measured to assess expectations.
Main Results:
- Nine-month-old infants looked longer at the mannequin than the person, indicating an expectation violation.
- This effect persisted even when hands were covered with gloves, ruling out simple feature matching.
- Six-month-old infants did not show differential looking, suggesting this expectation develops later.
Conclusions:
- Infants develop the expectation that hands are connected to a person between 6 and 9 months of age.
- This developmental milestone impacts how infants attribute goals and intentions to manual actions.
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