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Cerebral palsy (CP) is one of the most severe disabilities in childhood and it is a disorder of posture and movement due to a defect or lesion in the immature brain. People with CP are unable to control standard human-computer interfaces (e.g. mouse). Therefore, they need advanced devices, which reduce their limitations and empower their capabilities. This paper presents a wearable head-mounted interface based on inertial technology. Firstly, we present a study of relevant head motor signs for 14 users with CP. Secondly; we discuss the different methods of mapping between the human activity (input) and the command transmitted to the computer (output). According to the results, negative signs (insufficient muscle activity, as weakness or hypotonia) are more significant contributors to disability than positive signs (increased frequency of movements, as tremor, chorea or tics). This fact suggests that control modes based on velocity or acceleration might be more useful that control modes based on head posture. Nevertheless, since positive and negative motor signs are often simultaneously present, the interface should include different control modes in order to be usable for different types of users with CP.
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