The vertical vestibulo-ocular reflex, and its interaction with vision during active head motion: effects of aging.

摘要: The effects of aging on the vertical vestibulo-ocular reflex (VOR), and its interactions with vision during active head motion had not been investigated. We measured smooth pursuit, combined eye-head tracking, VOR, visual enhancement cancellation in pitch using a magnetic search coil technique 21 younger (age or = 65) subjects. With immobile, subjects pursued target moving sinusoidally frequency range 0.125 to 2.0 Hz, peak accelerations (PTAs) ranging from 12 789 degrees /s(2). Combined VOR darkness, fixation an earth-fixed (VVOR) were sinusoidal peak-to-peak amplitude 20 at frequencies 0.25, 0.5, 1.0 Hz. efficacy was determined gains tracking. VVOR symmetrical both directions did change aging, except for reduced downward low (0.25 Hz). However, elderly, tracking significantly lower than In young elderly groups, gain darkness vary while declined increasing frequency. performance implicates relative preservation neural structures subserving vestibular eye senescence.