<prompt> In Fitzgerald and Hallpike differential caloric test, cold water irrigation at 30deg centigrade in the left ear in a normal person will produce:Nystagmus to the right sideNystagmus to the left sideDirection changing nystagmusPositional nystagmus  <response>: a Nystagmus to the right sideRef. Scott Brown, 8th ed., Vol 2; page 796If the same is done with warm water the nystagmus will be towards the same side, i.e. left side.Direction changing nystagmus is seen in central lesions.Positional nystagmus is seen in BPPV. 