Fig. 10. Schematic drawing comparing vector components of equine and primate (human and monkey) vestibular acceleration in response to clockwise pitch rotation. Rectangle in the 3 o'clock position represents equine vestibular apparatus whereas rectangle in the 12 o'clock position represents primate vestibular apparatus. Circle with small arrowheads depicts direction of rotation about the pitch axis. Resultant vectors (R_h, R_p) and their horizontal (H_h, H_p) and vertical (V_h, V_p) components are depicted for horses and primates, respectively.