Document Detail

A dynamical system analysis of the development of spontaneous lower extremity movements in newborn and young infants.
MedLine Citation:
PMID:  21963825     Owner:  NLM     Status:  In-Data-Review    
This study's aim was to evaluate the characteristics of newborn and young infants' spontaneous lower extremity movements by using dynamical systems analysis. Participants were 8 healthy full-term newborn infants (3 boys, 5 girls, mean birth weight and gestational age were 3070.6 g and 39 weeks). A tri-axial accelerometer measured limb movement acceleration in 3-dimensional space. Movement acceleration signals were recorded during 200 s from just below the ankle when the infant was in an active alert state and lying supine (sampling rate 200 Hz). Data were analyzed linearly and nonlinearly. As a result, the optimal embedding dimension showed more than 5 at all times. Time dependent changes started at 6 or 7, and over the next four months decreased to 5 and from 6 months old, increased. The maximal Lyapnov exponent was positive for all segments. The mutual information is at its greatest range at 0 months. Between 3 and 4 months the range in results is narrowest and lowest in value. The mean coefficient of correlation for the x-axis component was negative and y-axis component changed to a positive value between 1 month old and 4 months old. Nonlinear time series analysis suggested that newborn and young infants' spontaneous lower extremity movements are characterized by a nonlinear chaotic dynamics with 5 to 7 embedding dimensions. Developmental changes of an optimal embedding dimension showed a U-shaped phenomenon. In addition, the maximal Lyapnov exponents were positive for all segments (0.79-2.99). Infants' spontaneous movement involves chaotic dynamic systems that are capable of generating voluntary skill movements.
Hirotaka Gima; Shohei Ohgi; Satoru Morita; Hiroshi Karasuno; Takayuki Fujiwara; Koji Abe
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of physiological anthropology     Volume:  30     ISSN:  1880-6805     ISO Abbreviation:  J Physiol Anthropol     Publication Date:  2011  
Date Detail:
Created Date:  2011-10-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101269653     Medline TA:  J Physiol Anthropol     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  179-86     Citation Subset:  IM    
School of Physical Therapy, Koriyama Institute of Health Sciences.
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