Inclusion Criteria:  Healthy subjects, Age 18-44 years.  Exclusion Criteria:  Consume of antipsychotics, antidepressants, antiarrythmics and/or anticonvulsivants Hippoacusia Auditory diseases Peripheral or central vestibulopathies Cerviogenic dizziness Balance disorders Nistagmus Oculomotor nerve dysfunctions Migraine Cervical osteoporosis, lashing or fracture Discal cervical hernia Cervical neuropathy Psychriatic disorders Epilepsy Pregnancy