ABSTRACT
The present study was conducted to evaluate the vestibulo-ocular reflex [VOR] using rotary chair. A new chair concept generating dynamic stimuli by alternating rotations in the horizontal plane of the chair's seat was recently developed. Twenty-five adult subjects suffering from variable peripheral vestibular lesions, proved by caloric testing, participated in the study. Eleven healthy normal adults served as controls; gender and age matched to the study group. Results of rotational sinusoidal harmonic acceleration [SHA] testing showed gain reduction at lower frequencies of rotation with improvement of gain at higher frequencies. Meanwhile, phase and symmetry parameters remained normal at all frequencies. Findings of SHA testing in the present study suggest the presence of a certain degree of compensation. This reflects remaining vestibular function, which could be utilized in vestibular rehabilitation