Quantification of finger-tapping angle based on wearable sensors

M Djurić-Jovičić, NS Jovičić, A Roby-Brami… - Sensors, 2017 - mdpi.com
We propose a novel simple method for quantitative and qualitative finger-tapping
assessment based on miniature inertial sensors (3D gyroscopes) placed on the thumb and
index-finger. We propose a simplified description of the finger tapping by using a single
angle, describing rotation around a dominant axis. The method was verified on twelve
subjects, who performed various tapping tasks, mimicking impaired patterns. The obtained
tapping angles were compared with results of a motion capture camera system …
We propose a novel simple method for quantitative and qualitative finger-tapping assessment based on miniature inertial sensors (3D gyroscopes) placed on the thumb and index-finger. We propose a simplified description of the finger tapping by using a single angle, describing rotation around a dominant axis. The method was verified on twelve subjects, who performed various tapping tasks, mimicking impaired patterns. The obtained tapping angles were compared with results of a motion capture camera system, demonstrating excellent accuracy. The root-mean-square (RMS) error between the two sets of data is, on average, below 4°, and the intraclass correlation coefficient is, on average, greater than 0.972. Data obtained by the proposed method may be used together with scores from clinical tests to enable a better diagnostic. Along with hardware simplicity, this makes the proposed method a promising candidate for use in clinical practice. Furthermore, our definition of the tapping angle can be applied to all tapping assessment systems.
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