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Abstract During sustained constant velocity and low-frequency off-vertical axis rotations (OVAR), otolith sig-
 

Summary: Abstract During sustained constant velocity and low-
frequency off-vertical axis rotations (OVAR), otolith sig-
nals contribute significantly to slow-phase eye velocity.
The adaptive plasticity of these responses was investigat-
ed here after semicircular canal plugging. Inactivation of
semicircular canals results in a highly compromised and
deficient vestibulo-ocular reflex (VOR). Based on the
VOR enhancement hypothesis, one could expect an
adaptive increase of otolith-borne angular velocity sig-
nals due to combined otolith/canal inputs after inactiva-
tion of the semicircular canals. Contrary to expectations,
however, the steady-state slow-phase velocity during
constant velocity OVAR decreased in amplitude over
time. A similar progressive decrease in VOR gain was
also observed during low-frequency off-vertical axis os-
cillations. This response deterioration was present in ani-
mals with either lateral or vertical semicircular canals in-
activated and was limited to the plane(s) of the plugged
canals. The results are consistent with the idea that the
low-frequency otolith signals do not simply enhance

  

Source: Angelaki, Dora - Department of Anatomy and Neurobiology, Washington University in St. Louis

 

Collections: Biology and Medicine