Sound-evoked vestibular stimulation affects the anticipation of gravity effects during visual self-motion
Sound-evoked vestibular stimulation affects the anticipation of gravity effects during visual self-motion
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DOI：
10.1007/s00221-015-4306-9
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发表时间：
2015-08-01
影响因子：
2
通讯作者：
Lacquaniti, Francesco
中科院分区：
文献类型：
--
作者：
Indovina, Iole;Mazzarella, Elisabetta;Lacquaniti, Francesco
在垂直方向的视觉模拟自我运动中，人类预期重力的影响。在这里，我们报告了由短音脉冲（STB）组成的人工前庭刺激抑制了这种预期。在虚拟现实过山车的下行或前进方向上，参与者在进入隧道时按下一个按钮。在不同的试验中，我们提供了STB，脉冲白噪声（WN）或无声（no）。在控制条件下（WN， NO），参与者在向下运动时比向前运动时反应更早，而不考虑真正的运动学，这与先验预期一致，即向下而不是向前运动是由重力加速的。机顶盒消除了两个方向之间的响应时间差异，而不影响整体任务性能。因此，我们认为前庭信号在自我运动中对可见重力效应的预期中起作用。
Humans anticipate the effects of gravity during visually simulated self-motion in the vertical direction. Here we report that an artificial vestibular stimulation consisting of short-tone bursts (STB) suppresses this anticipation. Participants pressed a button upon entering a tunnel during virtual-reality roller coaster rides in downward or forward directions. In different trials, we delivered STB, pulsed white noise (WN), or no sound (NO). In the control conditions (WN, NO), participants responded earlier during downward than forward motion irrespective of true kinematics, consistent with the a priori expectation that downward but not forward motion is accelerated by gravity. STB canceled the difference in response timing between the two directions, without affecting overall task performance. Thus, we argue that vestibular signals play a role in the anticipation of visible gravity effects during self-motion.