Positive and negative motor signs of head motion in cerebral palsy an analysis based on a wearable inertial human computer interface

This paper analyzes 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. This work present the use of a head mounted interface based on inertial technology to assess motor signs in fourteen users with CP. The task performance is related to the impairment. The analysis of the frequency shows that positive motor signs do not appear. However, users have limitations to maintain posture meaning that they have poor motor control, which is related to negative motor signs. The results and conclusions of this paper are considered a description of user´s needs, which will be used to design and optimize a new human computer interface specifically designed for people with CP.