Document Detail

Changes in object-oriented arm movements that precede the transition to goal-directed reaching in infancy.
MedLine Citation:
PMID:  21432846     Owner:  NLM     Status:  Publisher    
The emergence of prehensile skills in infancy is one of the central issues in motor development. The objective of this longitudinal study was to quantitatively describe the changes in the object-oriented arm movements that precede the transition to goal-directed reaching movements in infancy. Arm kinematics in 10 full-term infants were recorded biweekly from the age of 10 to 28 weeks while objects were presented for prehension. The kinematics were analyzed across three progressive phases of object-oriented arm movements (early, before, and after onset of reaching movements). As infant age increased through the stage of object-oriented movements, the distinguishing feature was that there was a decrease in movement jerk (when normalized to a dimensionless quantity), which reflects the increasing ability to adaptively modulate arm movements. This change in the dynamic characteristics of the object-oriented arm movements precedes the onset of goal-directed reaching movements and is hypothesised to reflect a critical variable in the infant developmental process of learning to reach in prehension. © 2011 Wiley Periodicals, Inc. Dev Psychobiol.
Mei-Hua Lee; Rajiv Ranganathan; Karl M Newell
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-22
Journal Detail:
Title:  Developmental psychobiology     Volume:  -     ISSN:  1098-2302     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0164074     Medline TA:  Dev Psychobiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Wiley Periodicals, Inc.
Department of Kinesiology, The Pennsylvania State University, 266 Recreation Building, University Park, PA 16802.
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