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J Neurophysiol 101: 714-720, 2009. First published December 10, 2008; doi:10.1152/jn.90612.2008
0022-3077/09 $8.00
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Optokinetic and Vestibular Responsiveness in the Macaque Rostral Vestibular and Fastigial Nuclei

Ayanna S. Bryan and Dora E. Angelaki

Department of Neurobiology, Washington University School of Medicine, St. Louis, Missouri

Submitted 27 May 2008; accepted in final form 4 December 2008

We recorded from rostral vestibular (VN) and rostral fastigial nuclei (FN) neurons that did not respond to eye movements during three-dimensional (3D) vestibular and optokinetic stimulation (OKS). The majority of neurons in both areas (76 and 69% in VN and FN, respectively) responded during both rotational and translational motion. Preferred directions scattered throughout 3D space for translation but showed some preference for pitch/roll over yaw for rotation. VN/FN neurons were also tested during OKS while monkeys suppressed their optokinetic nystagmus by fixating a head-fixed target. Only a handful of cells (VN: 17%, FN: 6%) modulated during 0.5-Hz OKS suppression, but the number of responsive cells increased (VN: 40%, FN: 48%) during 0.02-Hz OKS. Preferred directions for rotation and OKS were not matched on individual neurons, and OKS gains were smaller than the respective gains during rotation. These results were generally similar for VN and FN neurons. We conclude that optokinetic-vestibular convergence might not be as prevalent as earlier studies have suggested.

Address for reprint requests and other correspondence: D. Angelaki, Dept. of Anatomy and Neurobiology, Box 8108, Washington Univ. School of Medicine, 660 South Euclid Ave., St. Louis, MO 63110 (E-mail: angelaki{at}pcg.wustl.edu)






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