Sam. A, Saranyaa Gunalan, Ranjith. R


The study aims to establish normative data for VOR gain and also to assess the test-retest reliability of the SYNAPSYS vHIT Ulmer II System (version in young healthy adult participants. The VOR gain was measured for all canals across a range of head velocities for 200 participants divided into two groups in the age range of 17 to 25 years with a mean age of 20.38 years.  Group I (GI) – 17 to 20. 11 years, Group II (GII) – 21 – 25.11 years with a male to female ratio of 1:3. Descriptive analysis, one way AVOVA was employed to find out the significance between the VOR gain value of right lateral, right posterior, right anterior SCC’s and of left lateral, left posterior, left anterior SCC’s, Independent T test was used to assess the difference in the mean VOR gain value and Paired t test was computed to calculate the test retest reliability. The mean and standard deviation of VOR gains were 0.99 ± 0.06, 0.98 ± 0.06, 0.97 ± 0.08, 0.97 ± 0.08, 0.97 ± 0.05, and 0.97 ± 0.06 for right lateral, left lateral, right anterior, left anterior, right posterior and left posterior canals respectively. Gain differences between groups and genders were not statistically significant. The Video Head Impulse Test (vHIT) has some advantages compared to the gold standard test of horizontal SCC function including lower cost, minimal space requirements, greater portability and increased patient comfort.  


Vestibulo-Ocular Reflex Gain; Video Head-Impulse Test ; Synapse vHIT Ulmer II

Full Text:



Bansal, S., & Sinha, S. K. (2016). Assessment of VOR gain function and its test–retest reliability in normal hearing individuals. European Archives of Oto-Rhino-Laryngology, 273(10), 3167-3173.

Carhart, R., & Jerger, J. F. (1959). Preferred Method for Clinical Determination of Pure-Tone Thresholds. Journal of Speech and Hearing Disorders, 24(4), 330-345.

McGarvie, L. A., MacDougall, H. G., Halmagyi, G. M., Burgess, A. M., Weber, K. P., & Curthoys, I. S. (2015). The video head impulse test (vHIT) of semicircular canal function–age-dependent normative values of VOR gain in healthy subjects. Frontiers in neurology, 6, 154.

Murnane, O., Mabrey, H., Pearson, A., Byrd, S., & Akin, F. (2014). Normative data and test-retest reliability of the SYNAPSYS video head impulse test. Journal of the American Academy of Audiology, 25(3), 244-252.

Ulmer, E., Bernard-Demanze, L., & Lacour, M. (2011). Statistical study of normal canal deficit variation range. Measurement using the Head Impulse Test video system. European annals of otorhinolaryngology, head and neck diseases, 128(5), 278-282.

Ulmer, E., & Chays, A. (2005). Curthoys and Halmagyi head impulse test: an analytical device. In Annales d'oto-laryngologie et de chirurgie cervico faciale: bulletin de la Societe d'oto-laryngologie des hopitaux de Paris (Vol. 122, No. 2, pp. 84-90).

Weber, K. P., Aw, S. T., Todd, M. J., McGarvie, L. A., Curthoys, I. S., & Halmagyi, G. M. (2008). Head impulse test in unilateral vestibular loss Vestibulo-ocular reflex and catch-up saccades. Neurology, 70(6), 454-463.

Weber, K. P., MacDougall, H. G., Halmagyi, G. M., & Curthoys, I. S. (2009). Impulsive testing of semicircular‐canal function using video‐oculography. Annals of the New York Academy of Sciences, 1164(1), 486-491.


  • There are currently no refbacks.