The ontogeny of infant bimanual reaching during the first year |
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| Affiliation: | 1. The Children''s Hospital Medical Center, Boston USA;2. Connecticut College, Boston USA;1. Department of Neurosurgery, NewYork-Presbyterian Hospital, Weill Cornell Medical Center, New York City, NY, USA;2. Department of Neurosurgery, Washington University in St. Louis School of Medicine, St. Louis, MS, USA;3. Department of Neurosurgery, Columbia University, College of Physicians and Surgeons, New York City, NY, USA;4. Department of Neurology, Columbia University, College of Physicians and Surgeons, New York City, NY, USA;1. Landcare Research, Private Bag 1930, Dunedin 9054, New Zealand;2. School of Biological Sciences, University of Tasmania, Private Bag 55, Hobart, Tasmania 7001, Australia;3. Department of Ecology and Evolutionary Biology, University of Toronto, 25 Harbord St, Toronto, ON, M5S 3G5, Canada;4. One Health Research Group, College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, Queensland, Australia;1. Sri Ramachandra Institute of Higher Education and Research, Chennai, India;2. Christian Medical College, Vellore, India;1. Department of Psychology, University of Bologna, Italy;2. Department of Psychology, University of Pittsburgh, USA;3. Neonatology and Neonatal Intensive Care Unit—S. Orsola-Malpighi Hospital, Bologna, Italy;4. Department of Medical and Surgical Sciences, University of Bologna, Italy |
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| Abstract: | Handedness and pattern of coordination during bimanual reaching were assessed separately for six groups of infants, 7 to 12 months old. Infants reached bimanually for a transparent toy-filled box. On some presentations of the box a low barrier was placed in the path of either the right or left hand, while on other presentations there was no barrier. The youngest and two oldest groups of infants were more likely than the other age groups to perform simultaneous bimanual reaches with no barrier present, but when a barrier was present the 11-month-olds were most likely to continue to perform simultaneous reaches. This suggests that while infants as young as 7 months perform simultaneous reaches, the organization of these reaches may be different than for older infants. Hand-use preference contributed significantly to selection of a lead hand in non-simultaneous bimanual reaching. The 8-month group, which had the highest proportion of infants with a hand preference, was the only group likely to hit the barrier when it was placed on the nonpreferred side. Hand preference may, thus, bias the use of information about what the environment affords for action. |
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