Eye velocity asymmetry, ocular orientation, and convergence induced by angular rotation in the rabbit.
We studied ocular asymmetries and orienting responses induced by angular rotation in rabbits with binocular video recordings. Slow phase velocities were significantly larger in the eye moving temporonasally than nasotemporally. The eyes also converged and pitched down during rotation, which increased and refocused binocular overlap in the visual fields. Eye position also shifted into the slow phase direction. Vergence and pitch outlasted the induced nystagmus, suggesting that they were generated by a separate vestibulo-oculomotor subsystem(s). Thus, mechanisms in the rabbit increase compensatory eye velocity in the eye that leads into the direction of rotation and enhance binocular vision.
Maruta
Jun
J
Department of Neurology, Mount Sinai School of Medicine, New York, NY, USA.
MacDougall
Hamish G
HG
Simpson
John I
JI
Raphan
Theodore
T
Cohen
Bernard
B
D000818:Animals; D003290:Convergence, Ocular / Q000502:physiology; D005133:Eye Movements / Q000502:physiology*; D019416:Head Movements / Q000502:physiology; D009760:Nystagmus, Physiologic / Q000502:physiology; D009949:Orientation / Q000502:physiology; D011817:Rabbits; D012027:Reflex, Vestibulo-Ocular / Q000502:physiology*; D012399:Rotation; D014741:Video Recording; D015348:Vision, Binocular / Q000502:physiology