Document Detail

Hypothesis regarding the transformation of the intended direction of movement during the production of graphic trajectories: a study of drawing movements in 8- to 12-year-old children.
MedLine Citation:
PMID:  18653177     Owner:  NLM     Status:  MEDLINE    
Children from 8 to 12 years of age drew figure-eights and ellipses at a self-chosen tempo on a digitizing tablet. Global aspects (perimeter and average speed) and local aspects (relation between instantaneous speed and curvature) of performance were analyzed across age groups and types of figures. We tested the predictions of the transformation model, which is based on the hypothesis that changing the intended direction of movement is a time-consuming process that affects the evolution in time of the movement trajectory, and compared how well it fitted the data relative to the power law. We found that the relation between speed and curvature was typically better described by the transformation model than by the power law. However, the power law provided a better description when ellipses were drawn at a fast speed. The analyses of the parameters of the transformation model indicate that processing speed increased linearly with age. In addition, the results suggest that the effects of the spring-like properties of the arm were noticeable when ellipses were drawn at a fast speed. This study indicates that both biomechanical properties and central processes have an effect on the kinematics of continuous movements and particularly on the relation between speed and curvature. However, their relative importance varies with the type of figure and average movement speed. In conclusion, the results support the hypothesis that a time-consuming process of transformation of the intended direction of movement is operating during the production of continuous movements and that this process increases in speed between 8 to 12 years of age.
Giuseppe Pellizzer; Pascal Zesiger
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2008-06-14
Journal Detail:
Title:  Cortex; a journal devoted to the study of the nervous system and behavior     Volume:  45     ISSN:  0010-9452     ISO Abbreviation:  Cortex     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-02-02     Completed Date:  2009-06-24     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0100725     Medline TA:  Cortex     Country:  Italy    
Other Details:
Languages:  eng     Pagination:  356-67     Citation Subset:  IM    
Brain Sciences Center, Veterans Affairs Medical Center, Minneapolis, MN, USA.
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MeSH Terms
Imitative Behavior
Motor Skills / physiology*
Movement / physiology*
Photic Stimulation / methods
Psychomotor Performance / physiology
Space Perception / physiology*
Visual Perception / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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