Posterior canal exercises are a modification of the BrandtDaroff exercises. This treatment modification for posterior canal BPPV was developed in August 2006 by Dr. Teixido in the 3D visualization laboratory at the Delaware Biotechnology Institute. This exercise is appropriate for any BPPV patient, even if the side of disease is not known. The posterior canal exercise moves otoconia 60° farther around the circumference of the posterior semicircular duct with each repetition than conventional BrandtDaroff exercises. The extra motion toward the posterior canal ampulla may enhance contact of the otoconia with cells at the base of the ampulla which may play an important role in otoconia resorption. This exercise has been used effectively on many patients but a formal study of its comparative effectiveness has not been completed.