1. First, the presence of nystagmus will be assessed with Frenzel goggles in a supine position after at least five minutes of rest. When no spontaneous nystagmus is present in the main gaze positions, the presence of a positional nystagmus will be assessed by the Pagnini test first and then by the Dix-Hallpike test (5). The presence of a positional, transient nystagmus will be considered typical of BPPV.