Toy-oriented changes during early arm movements: hand kinematics.

Toy-oriented changes during early arm movements: hand kinematics. Research Abstract Details 

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Toy-oriented changes during early arm movements: hand kinematics. Abstract Text:

A N Bhat,J C Galloway,A N Bhat,J C Galloway,

In a recent cross-sectional study, we found that young infants changed their spontaneous arm movements in the presence of a toy, termed 'toy-oriented changes', in systematic ways beginning many weeks before their first consistent reaches [Bhat, A. N., Heathcock, J. H., & Galloway, J. C. (2005). Toy-oriented changes in hand and joint kinematics during the emergence of purposeful reaching. Infant Behavior and Development, 28(4), 445-465]. The purpose of the present study was to test specific hypotheses regarding toy-oriented changes in a longitudinal design. METHODS: Thirteen infants were observed every other week from 8 weeks of age up to the onset of reaching. At each session, hand and joint motions were observed with and without a toy present using a high-speed motion capture system. This paper focuses on the toy-oriented changes in hand variables. RESULTS: As predicted, infants displayed a meaningful pattern of toy-oriented changes, which systematically changed as infants approached the first week of reaching. During the Early phase (8-10 weeks before reaching), infants scaled down their movement length and speed in the presence of a toy. During the Mid phase (4-6 weeks before reaching), infants scaled up movement number and speed, increased movement smoothness, and decreased their hand-toy distance in the presence of a toy. During the Late phase (within 2 weeks of reaching), infants continued to change their hand's position to get closer to the toy and began contacting it. Interestingly, movement number and smoothness displayed similar developmental patterns, where movement length and speed displayed similar patterns. CONCLUSION: Toy-oriented adaptation of arm movements emerges in the first months of life and forms a complex, yet tractable continuum with purposeful reaching. These results provide a foundation to test more specific hypotheses of hand and joint coordination in both typically developing infants and those infants born at risk for coordination impairments.

Toy-oriented changes during early arm movements: hand kinematics. Publishing Authors By Initials

AN Bhat,JC Galloway,AN Bhat,JC Galloway,

For similar psychological phenomena and processes: psychomotor performance research abstracts see: psychological phenomena and processes: psychomotor performance research

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Toy-oriented changes during early arm movements: hand kinematics. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Infant behavior & development

VOLUME: 29

Page Numbers: 358-72

Journal Abbreviation:

ISSN: 0163-6383

DAY: 7

MONTH: 03

YEAR: 2006

Toy-oriented changes during early arm movements: hand kinematics. Information

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LANGUAGE: eng

NlmUniqueID: 7806016

Toy-oriented changes during early arm movements: hand kinematics. Keywords Mesh Terms:

KEYWORDS: Psychomotor Performance

MESH TERMS: physiology

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Grant and Affiliation Information for Toy-oriented changes during early arm movements: hand kinematics.

AFFILIATION: Infant Motor Behavior Laboratory, Department of Physical Therapy, Biomechanics and Movement Science Program, University of Delaware, Newark, DE 19716, USA.

Country: United States

AGENCY: United States NICHD

GRANT: HD43830

ACRONYM: HD

MEDLINETA: Infant Behav Dev

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