<prompt> Answer this question truthfullyWhat is the specific type of nystagmus that is typically observed with positional testing in patients with peripheral vertigo, and how is peripheral vertigo characterized?  <response>: <reason> Patients with peripheral vertigo typically exhibit delayed nystagmus in the horizontal direction with positional testing. Peripheral vertigo is characterized by a dysfunction in the peripheral vestibular system, which can result in symptoms such as dizziness, vertigo, and balance problems. 