FIG. 2.

Mean 3D VOR eye responses of a rhesus monkey (F234RhD) during actual 50 °/s peak, 1 Hz, passive whole-body rotations measured in darkness 2 h after onset on of chronic, continuous motion-modulated stimulation on day 1 of the adaptation paradigm. A–C Normal responses before gentamicin treatment and MVP implantation, during rotations predominantly exciting the left and right horizontal (LH and RH, A), left anterior/right posterior (LARP, B), and right anterior/left posterior (RALP, C) canals. In each case, horizontal, LARP, and RALP components of the 3D VOR response are shown in red/solid, green/dashed, and blue/long dash lines, respectively, and the canal being excited during a given half cycle is designated. (By the right-hand rule convention used to describe 3D eye movements, VOR responses to LH excitation are negative, whereas responses to LA and LP excitation are positive.) D–F Responses to whole-body rotation measured after gentamicin and multichannel vestibular prosthesis (MVP) electrode implantation, with the MVP set to pulse at constant rates independent of head motion. G–O 3D VOR responses measured on the first day of continuous motion-modulated MVP stimulation (G–I), third day (J–L), and seventh day (M–O). Each panel shows mean of 10–20 cycles free of quick phases. SD < 5 °/s at every time point for every trace. P–R Cycle to cycle variation for the measurements shown in mean form in A, D, and M.