Abstract
Vestibular prosthetics transmit angular velocities to the nervous system via electrical stimulation. Head-fixed gyroscopes measure angular motion, but the gyroscope coordinate system will not be coincident with the sensory organs the prosthetic replaces. Here we show a simple calibration method to align gyroscope measurements with the anatomical coordinate system. We benchmarked the method with simulated movements and obtain proof-of-concept with one healthy subject. The method was robust to misalignment, required little data, and minimal processing.
Highlights
Imagine waking up one morning, opening your eyes, and seeing your bedroom rotated 90 degrees
This holds despite the fact the Head-Mounted Motion Sensor (HMMS)-HEAD misalignment had 50× higher variance when a Bite-Bar Sensor (BBS) was used
Alignment of sensor pairs Through the simulations above, we have shown the advantages of aligning the HMMS to the HEAD via a BBS rather than manual HMMS-HEAD alignment during surgery
Summary
Imagine waking up one morning, opening your eyes, and seeing your bedroom rotated 90 degrees. The brain is capable of resolving misalignment between normal and received sensory information through the mechanism of neural plasticity. Gonshor and Mevill Jones showed one dramatic example of such plasticity in their work using prism glasses [1]. These glasses inverted subjects’ view of the world (e.g. right is left), but over days subjects adjusted their vestibulo-ocular (VOR) reflexes; by 18 days the VOR had reversed to match visual information. Such plasticity is neither immediate nor free. Subjects in preliminary trials reported “rapid and severe nausea” [1] and VOR following adaptation to vision reversal never fully mimicked normal responses
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