Jessica M. Hanson

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New methods of rotational testing of the vestibulo-ocular reflex (VOR) using manually generated or patient-generated sinusoidal head movements have recently been advocated for clinical use in circumstances where conventional rotary chair testing methods are not feasible. However, studies seeking to provide evidence for the validity of these methods by(More)
OBJECTIVES/HYPOTHESIS Manual whole-body and head-on-body rotational testing of the vestibuloocular reflex (VOR) is comparable to conventional rotary chair methods with and without visual fixation from 0.025 to 1 Hz. STUDY DESIGN Summary of four previously published trials from our laboratory and a fifth prospective blinded study comparing whole-body and(More)
The currently accepted "gold standard" for rotational testing of the vestibulo-ocular reflex uses a servo-controlled chair for sinusoidal whole-body rotation. Previous work in our laboratory has shown good concordance between conventional rotational chair testing and head-on-body (or "head-shake") testing for gain and phase values of the vestibulo-ocular(More)
During the last 10 years, computerized dynamic posturography has yielded various patterns of sway on the sensory organization test and the motor control test that have been associated with a variety of organic balance disorders. Some aspects of performance during computerized dynamic posturography, however, are under conscious control. Voluntary movements(More)
We describe the clinical and laboratory features of 13 patients with bilateral loss of peripheral vestibular sensitivity of no known cause. In the office, screening for this condition was possible using illegible e-testing and examination of the patient for refixation saccades after brisk head movements while attempting visual fixation. Diagnosis was(More)
Broad-frequency rotational chair testing is employed in clinical and research settings to evaluate the response of the vestibulo-ocular reflex (VOR) over a range of frequencies. Accurate computation of the gain and phase of the VOR is dependent upon the assumption that the subject's head is rigidly coupled to the rotating chair over the range of frequencies(More)
I N JUNE, the Bureau of Economic Analysis (BEA) released annual revisions of the U.S. international transactions accounts (ITAs) and the U.S. interna­ tional investment position (IIP) accounts. 1 Through annual revisions, BEA introduces new definitions and classifications, newly available and more complete source data, new and improved methodologies, and(More)
Test-retest reliability of rotational chair testing for a single facility has previously been examined by others. The actual data analysis methods, however, have received far less attention. The variety of both hardware and software currently used theoretically may affect the results for a given subject tested at different facilities. The purposes of this(More)
Standardization of rotational chair testing across laboratories has not been achieved because of differences in test protocol and analysis algorithms. The Interlaboratory Rotational Chair Study Group was formed to investigate these differences. Its first study demonstrated significant variability in calculated results using actual patient data files. No(More)
In this study, we examined age-related effects upon modulation of the VOR with visual and imaginary targets during sinusoidal harmonic acceleration. Eight young (< 30 years) and 5 elderly (> 65 years) subjects were tested using sinusoidal whole-body rotation at 0.025 Hz, 0.1 Hz, and 0.5 Hz. Peak velocity for all trials was 50 degrees/s. Mean VOR gain and(More)
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