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Positive and Negative Motor Signs of Head Motion in Cerebral Palsy: Assessment of Impairment and Task Performance

AuthorsVelasco, Miguel A. ; Raya, Rafael ; Ceres Ruiz, Ramón ; Clemotte, Alejandro ; Ruiz Bedia, A.; González Franco, T.; Rocón, Eduardo
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Performance evaluation
Cerebral palsy (CP)
Human–computer interface
Motor disorder
Magnetic heads
Issue Date2014
PublisherInstitute of Electrical and Electronics Engineers
CitationIEEE Systems Journal PP: 1-7 (2014)
AbstractThis paper analyzes the presence of positive and negative motor signs in people with cerebral palsy (CP). Positive motor signs are those that lead to involuntarily increased frequency or magnitude of muscle activity. Negative motor signs describe insufficient muscle activity or insufficient control of muscle activity. In this paper, a head-mounted alternative computer interface based on inertial technology was used to assess motor signs in seven users with CP. Task performance and control of posture was related to the impairment. There are no significant differences between users with CP and healthy control participants in the frequency domain of the head movement. Results suggest that this kind of motor disorders is not related to positive motor signs. Moreover, a control mode based on posture more than on movements is not optimum; an alternative control mode must be specially designed for users with poor postural control.
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