Technical Brief

Temporal Discretization Errors Produce Minimal Effects on Vestibular Prosthesis Performance1

[+] Author and Article Information
Peter J. Boutros, Nicolas Valentin, Kristin N. Hageman

Department of Biomedical Engineering,
Johns Hopkins School of Medicine,
Baltimore, MD 21205

Dale Roberts, Chenkai Dai

Otolaryngology—Head and Neck Surgery,
Johns Hopkins School of Medicine,
Baltimore, MD 21205

Charles C. Della Santina

Department of Biomedical Engineering,
Johns Hopkins School of Medicine,
Baltimore, MD 21205;
Otolaryngology—Head and Neck Surgery,
Johns Hopkins School of Medicine,
Baltimore, MD 21205

DOI: 10.1115/1.4033733Manuscript received March 1, 2016; final manuscript received March 16, 2016; published online August 1, 2016. Editor: William Durfee.

J. Med. Devices 10(3), 030958 (Aug 01, 2016) (3 pages) Paper No: MED-16-1076; doi: 10.1115/1.4033733 History: Received March 01, 2016; Revised March 16, 2016

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Grahic Jump Location
Fig. 1

Head velocity-to-pulse rate map encoding head motion using PFM. Dark trace: sPFM map. Light trace: discretized PFM (dPFM) map that typifies the time discretization errors inherent to a CIS-like strategy.

Grahic Jump Location
Fig. 2

Electrically evoked aVOR recording for a virtual 0.5 Hz sinusoidal movement in the LARP plane with a peak velocity of 300 deg/s. Traces are separated into components along mean SCC axes (solid bold = LARP, dashed bold = RALP, and dotted bold = LHRH) and presented as mean (bold) ± SD (dashed light) over > 14 cycles. The left and right ordinates indicate eye velocity and stimulus pulse rate, respectively. Left panel: aVOR response using the sPFM map. Right panel: aVOR response using dPFM map.

Grahic Jump Location
Fig. 3

Mean ± SD aVOR gain as a function of frequency. Panels indicate virtual sinusoids applied in the (a) LARP, (b) RALP, and (c) LHRH planes. Solid curve represents the sPFM map, while the dashed curve represents the dPFM map.



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