###### Abstract  
Postural instability is a common symptom of vestibular dysfunction due to an insult to the vestibular system. Vestibular rehabilitation is effective in decreasing dizziness and visual symptoms, and improving postural control through several mechanisms, including sensory reweighting. As part of the sensory reweighting mechanisms, vestibular activation training with headshake activities influences vestibular reflexes. However, combining challenging vestibular and postural tasks to facilitate more effective rehabilitation outcomes is underutilized. Our research goal is to develop a virtual reality vestibular rehabilitation method for vestibular-postural control in neurological populations with vestibular and/or sensorimotor control impairment. The NeuroCom(r) SMART Balance Master (Natus Medical Inc., Pleasanton, CA, USA), which was used in a prior study, is expensive and bulky. Hence, a novel study protocol is established in this paper with the detailed objectives and pre-/post-intervention data analysis pipeline (ANOVA, \(t\)-test, post hoc analysis, etc.) involving modern off-the-shelf sensors and custom instrumentation (electromyography, electrooculography, video head impulse testing, force plates, and virtual reality headsets). It is expected that the training will significantly decrease vestibuloocular reflex gains and eye movement variability, as well as reweight the somatosensory ratio, finetune postural muscle activation, and consequently improve postural flexibility and produce a faster automatic postural response. The findings may have implications for the future development of vestibular rehabilitation protocols. s 2022  
adaptation, habituation, long-term potentiation (LTP), long-term depression (LTD), and sensory reweighting [6; 9; 10; 11]. Several traditional vestibular rehabilitation methods focus mainly on head movements to activate the vestibular system. Adding balance training to vestibular activation activities has demonstrated significant improvement in subjective dizziness, oculomotor control, balance, and gait in neurologic patients [12; 13; 14]. Using the underlying mechanisms in vestibular rehabilitation, we demonstrated beneficial outcomes in vestibular and motor responses in healthy young adults following our concurrent headshake and weight shift training (Concurrent HS-WST) protocol. In this protocol, participants volitionally performed simultaneous weight shifts in standing and rhythmic head rotations in the horizontal direction while following targets on the computer screen of the NeuroCom(r) SMART Balance Master (Natus Medical Inc., Pleasanton, CA, USA). The simultaneous activity decreased the training duration in performing both activities and consequently encouraged real-time sensory reweighting and integration. The findings showed that there were significant positive changes in the vestibuloocular reflex (VOR) gain, eye movement variability, somatosensory reweighting, muscle activity in medial gastrocnemius, mediolateral sway, automatic postural control, and postural flexibility [15; 16]. However, the NeuroCom(r) is a large, heavy, and expensive system; these qualities render it inaccessible to clinicians and other researchers aiming to obtain these promising benefits of the Concurrent HS-WST protocol. To improve on the effectiveness and accessibility of the Concurrent HS-WST [15], the training will be adapted to a low cost, portable virtual reality (VR) tool. VR is one of the novel methods to engage individuals to participate in vestibular rehabilitation [17]. Using a VR environment to design a vestibular rehabilitation protocol may decrease the tediousness associated with the therapy and increase patients' motivation and training adherence [18; 19]. Performing the therapy in the immersive environment can better improve clinical outcomes compared to traditional vestibular rehabilitation methods [20; 21; 22].