Maturational and situational determinants of reaching at its onset |
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| Affiliation: | 1. Department of Physical Therapy, Neuropediatrics Section, Federal University of São Carlos, 13565-905 São Carlos, SP, Brazil;2. Physical Therapy, Center of Biological and Health Sciences, Federal University of Mato Grosso do Sul, Postal Box 549, 79070900 Campo Grande, MS, Brazil;3. Department of Health Sciences, Federal University of São Paulo, 11015-020 Santos, SP, Brazil;4. Department of Psychology, Uppsala University, Box 1225, SE-75142 Uppsala, Sweden;1. Institute of Child Development at the University of Minnesota, Minneapolis;2. Carolina Institute for Developmental Disabilities and the University of North Carolina (UNC) at Chapel Hill, NC;3. University of North Carolina at Chapel Hill;4. Washington University in St. Louis;5. University of Washington, Seattle;6. Dr. Paterson is with the Children’s Hospital of Philadelphia;7. Dr. Zwaigenbaum is with the University of Alberta, Edmonton, Alberta, Canada;1. The University of Tennessee, Knoxville;2. Brigham and Women''s Hospital and Harvard Medical School, Cambridge, Mass |
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| Abstract: | At 3 months of age, reaching behavior was measured in a group of 10 girls and 10 boys born at term. The assessments were carried out on the average 2 days after reaching onset. Reaching kinematics was measured in both supine and reclined positions. Girls reached more than boys, had straighter reaching trajectories and movements of shorter durations as well as fewer movement units. The reclined position gave rise to straighter trajectories in both girls and boys. Several anthropometric parameters were measured. Girls had less length and volume of the forearm than boys but similar upper arm volumes. There was a weak relation between kinematic and anthropometric variables. |
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| Keywords: | Reaching Gender Infant Motor development |
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