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Plane-specific reorientation of post-rotatory nystagmus during static roll tilt in the cat



Plane-specific reorientation of post-rotatory nystagmus during static roll tilt in the cat



Society for Neuroscience Abstracts 27(1): 1061



We have used an earth-vertical axis rotation (EVAR) to study the influence of the static roll tilt on the spatial orientation of post-rotatory nystagmus (PRN) in the cat. The animal was rotated about EVAR with different primary head roll positions at a constant velocity of 100 deg/s with an acceleration and deceleration of 120 deg/s*s. Within two second after stopping of EVAR, the animal was passively tilted at 45 deg/s about its longitudinal axis by as much as +-90 deg in steps of 15 deg. Eye movements were measured with magnetic search coils. The angle of the plane of PRN and its velocity were measured. The plane of a PRN with a primary head position of 0 deg (upright) remained an earth horizontal within a range of roll angle of +-45 deg. Beyond this range, the PRN did not remain the earth horizontal. The vectoring of the nystagmus onto the earth horizontal took time to build up. Also, a PRN with primary head roll positions of 30 deg and 60 deg vectored onto the earth-horizontal, and remained the earth horizontal for roll tilts from the primary positions toward either uptight or eardown positions. A PRN with a primary head position of 90 deg (ear-down) was, however, decayed closely along with the plane of vertical semicircular canal stimulation for head roll tilts by as much as 90 deg. These results indicate a non-linear and plane-specific interaction of semicircular canal and otolith signals on the velocity storage mechanism in cats.

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Accession: 035506159

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