With regard to nystagmus:
a. caloric nystagmus occurs when iced water is poured into the ear
b. vestibular nystagmus occurs as a consequence of head rotation
c. optokinetic nystagmus occurs as a consequence of the relative motion of the visual field
d. all above
a. caloric nystagmus occurs when iced water is poured into the ear
b. vestibular nystagmus occurs as a consequence of head rotation
c. optokinetic nystagmus occurs as a consequence of the relative motion of the visual field
d. all above