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Our results showed higher VOR gains and poorer fixation abilities in children with cADHD compared with typically developing children. Cerebellar dysfunction in patients with ADHD has been well documented in the literature, and our findings of cVEMP and rotary chair tests for these children showed impaired vestibular function in these children, based on increased VOR gain values and decreased fixation capabilities. Because VOR gain is mediated through the inferior olive and controlled by the cerebellum, our results suggest that central inhibition of vestibular function may be deficient in children with cADHD, resulting in higher VOR gains. Also, there is general agreement that failure of fixation suppression indicates a central lesion. The lesion can originate from the parietal-occipital cortex, the pons, or the cerebellum. However, failure of fixation suppression is most prominent in lesions involving the midline cerebellum that could be counted for children with cADHD. We believe that this contribution is theoretically and practically relevant as high VOR gains and decreased suppression capabilities may result in symptoms of reading and writing difficulties, learning disabilities, vertigo, and motion sickness in these children. Therefore, assessment of vestibular function in children with cADHD at a young age must be considered when developing rehabilitation protocols for these children.

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The vestibular system is important for the development of normal movement reactions, motion tolerance, and motor control for postural alignment, balance, and vision. A vestibular system that is damaged by disease or injury in childhood can have a major impact on a child's development. In addition, the emergence of vestibular lesions may also lead to cognitive deficits, including attention deficit. Despite the advances in testing and documentation of vestibular deficits in children, the vestibular problems continue to be an overlooked entity. Many children do not receive treatment that could significantly improve function and address the developmental delays caused by vestibular disorders. Vestibular rehabilitation therapy (VRT) has been defined as an effective modality for most individuals with disorders of the vestibular or central balance system disorders. The basis for the success of VRT is the use of existing neural mechanisms in the human brain for adaptation, plasticity, and compensation. The vestibular system cannot be considered as a separate entity ignoring other balance subsystems. Hence, a modified VRT program, named pediatric balance therapy with special modifications in exercises, was developed for children with vestibular disorders, in accordance to the whole balance system.

Objective Balance system and postural control are one of the major problems in people with multiple sclerosis. Therefore, the assessment of the balance system and postural control is very essential. Identification and use of standard tools can be a practical solution for more purposeful plan in this issue. Several tools have been used to investigate the balance disorders in these patients, which solely able to screen equilibrium problems, and only predict the risk of falling in the elderly. These questionnaires cannot help the therapist to diagnose the underlying causes of imbalance and also are not useful in directing the purposeful therapeutic process. The Balance Evaluation Systems Test (BESTest) was designed from 1990 to 1999 by Dr. Horak in the Continues Medical Education System. This questionnaire is based on the Bernstein's theory of motor control, and the test evaluates Biomechanical, Stability Limits, Postural Responses, Anticipatory Postural Adjustments, Sensory Orientation, and Dynamic Balance through 36 questions. The objective of this study was to determine the validity and reliability of the BESTest evaluation system in patients with multiple sclerosis after providing a coherent version of the questionnaire in Persian. Materials & Methods This is a methodological and non-experimental study. The BESTest questionnaire was translated by the researcher. The face validity of the questionnaire was evaluated by a survey of 21 patients with multiple sclerosis. The content validity of the questionnaire was further evaluated by a survey of 6 specialists in the field of rehabilitation (three occupational therapists and three specialists in the field of physiotherapy). After that, the BESTest questionnaire and Berg questionnaire were completed by two researchers (the author and another examiner) for 110 people diagnosed as multiple sclerosis, considering inclusion and exclusion criteria, from north, south, east, west, and center of Tehran in the years 2016-2017. After one week, 36 patients from the first stage were reevaluated in with a BESTest questionnaire by the researcher to evaluate the test-retest reliability. The internal consistency with Cronbach's alpha coefficient, test-retest reliability by intra-class correlation coefficients traces, inter-rater reliability coefficients of correlation between the traces, and convergent validity between the two questionnaires (BESTest and Berg) with Pearson correlation coefficient were investigated. Results The content validity of the questionnaire (the comprehensibility, relevance of the questions, and the cultural matching of words), which were measured by the CVR and CVI statistical methods, were approved by the specialist (CVI>0.79 and CVR>0.99). Pearson correlation coefficient between all the domains of the BESTest questionnaire (except for the second domain) with the score of the Berg questionnaire was between 0.79 and 0.93. Given that the numbers are above the minimum acceptable value of 0.70 indicates a good convergence between these two questionnaires. By r...

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