Research Article

Comparing mastoid and posterior cervical muscles vibration effects on eye movement in normal subjects


Background and Aim: Vibration is a method for stimulating the vestibular system. This method can unmask asymmetry between two vestibular systems (such as unilateral peripheral vestibular disorders). The occurrence of vibration-induced nystagmus (VIN) in healthy subjects can affect the diagnosis of patients with unilateral peripheral vestibular disorders. Thus, the evaluation of VIN in healthy subjects is critical to help the diagnosis of unilateral peripheral vestibular disorders.
Methods: This study was carried out on 72 healthy subjects (mean ± SD age: 27.12 ± 4.97 years) in the Auditory and Balance Clinic of Rofeideh Rehabilitation Hospital. Vibration sti­mulation with a frequency of 30 and 100 Hz was used on mastoid and posterior cervical muscles (PCMs) and simultaneously eye movements were recorded and analyzed using videonystagmography.
Results: The mastoid vibration with a frequency of 30 and 100 Hz, respectively produced VIN in 16.67 % and 27.78 % of subjects and VIN observed in PCMs vibration with a frequency of 30 and 100 Hz in 4.17 % and 9.72 % of the subjects.
Conclusion: The occurrence of VIN in healthy subjects was more probable with mastoid vibration in 100 Hz. In this study, VIN was predominantly horizontal, its direction was toward the stimulated side, and its slow phase velocity was lower than 5 deg/s. These criteria could be used for differentiation between normal and abnormal subjects.

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IssueVol 28 No 4 (2019) QRcode
SectionResearch Article(s)
Vibration-induced nystagmus; vestibular vibration; mastoid, posterior cervical muscle; videonystagmography

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How to Cite
Naghibi N, Shaabani M, Bakhshi E. Comparing mastoid and posterior cervical muscles vibration effects on eye movement in normal subjects. Aud Vestib Res. 2019;28(4):242-248.