Perturbation of a skilled action 2. normalising the responses of cerebral palsied individuals |
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| Affiliation: | 1. Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, The Recanati-Kaplan Centre, Tubney House, Abingdon Road, Tubney, Abingdon OX13 5QL, UK;2. Panthera, 8 West 40th Street, 18th Floor, New York, NY 10018, USA;3. Freeland Foundation, Maneeya Center Building, 8th Floor, 518/5 Ploenchit Road, Bangkok 10330, Thailand;4. Centre for Tropical Environmental and Sustainability Science, College of Marine and Environmental Sciences, James Cook University, Cairns, Queensland 4870, Australia;5. Kenyir Research Institute, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Malaysia;6. Rimba, 4 Jalan 1/9D, 43650 Bandar Baru Bangi, Selangor, Malaysia;7. School of Geography, University of Nottingham Malaysia Campus, Semenyih 43500, Selangor, Malaysia;8. School of Science, Monash University, 46150, Malaysia;9. School of Biological Sciences, University of Hong Kong, Hong Kong, China;10. Wildlife Conservation Society, Global Conservation Program, 2300 Southern Boulevard, Bronx, NY 10540, USA;11. Karen Wildlife Conservation Initiative, P.O. Box 204, Chiang Mai 50205, Thailand;12. The Royal Zoological Society of Scotland, 134 Corstorphine Road, Edinburgh EH12 6TS, Scotland;13. Wildlife Conservation Society Myanmar Program, Yangon 11051, Myanmar;14. Zoological Society of London – Thailand, 36/12 MU 4, T. Nong Bua, A. Kanchanaburi 71190, Thailand |
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| Abstract: | Subjects were trained to execute a radial elbow extension of prescribed arc and velocity profile. A DC servomotor was used to introduced brief perturbations, opposing extension. Neurologically normal and cerebral palsied subjects' reactions to a range of perturbation magnitudes were tested. The training stage of the study was designed to provide cerebral palsied subects with an electromyographic target profile of how to respond to a given perturbation,modelled on the performances of neurologically normal subjects, but taking account of individual differences in how non-perturbed arm swings were executed electromyographically. In the event, spastic subjects were not hyperreactive to perturbations when tested. A follow-up study confirmed the interpretation that this was a consequence of learning to perform the test arm swing with stringent precision. The implications of the study for models of spasticity and prospects for rehabilitation are discussed. |
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