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Differential Sensorimotor Processing of Vestibulo-Ocular Signals during Rotation and Translation
 

Summary: Differential Sensorimotor Processing of Vestibulo-Ocular Signals
during Rotation and Translation
Dora E. Angelaki, Andrea M. Green, and J. David Dickman
Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110, and
Department of Research, Central Institute for the Deaf, St. Louis, Missouri 63110
Rotational and translational vestibulo-ocular reflexes (RVOR
and TrVOR) function to maintain stable binocular fixation during
head movements. Despite similar functional roles, differences in
behavioral, neuroanatomical, and sensory afferent properties
suggest that the sensorimotor processing may be partially
distinct for the RVOR and TrVOR. To investigate the currently
poorly understood neural correlates for the TrVOR, the activities
of eye movement-sensitive neurons in the rostral vestibular
nuclei were examined during pure translation and rotation un-
der both stable gaze and suppression conditions. Two main
conclusions were made. First, the 0.5 Hz firing rates of cells that
carry both sensory head movement and motor-like signals
during rotation were more strongly related to the oculomotor
output than to the vestibular sensory signal during translation.
Second, neurons the firing rates of which increased for ipsilat-

  

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

 

Collections: Biology and Medicine