Marcus J T, Van Holten C R
TNO Institute for Perception, Soesterberg, The Netherlands.
Aviat Space Environ Med. 1990 Jul;61(7):631-5.
The influence of high +Gz gravito-inertial force on the vestibular system in man was investigated in a 4-m centrifuge with a freely swinging gondola. The Gz profile was: acceleration +0.2 Gz/s, +3 Gz sustained for 3 min, deceleration -0.2 Gz/s. The subject was exposed to this profile under two conditions in randomized order: facing forward and facing backward. Under these conditions, the effective angular velocity in the plane of the vertical semicircular canals is opposed. Adding the slow phase velocity responses from these conditions yields the Gz effect only; subtracting yields the angular velocity effect only. Vertical vestibular nystagmus was analysed in five subjects. Results indicate that +3 Gz induced a subject-dependent vertical nystagmus with slow phase downwards. The average amplitude of this nystagmus reached a maximum of 27 degrees/s at 16 s from G onset, and was 11 degrees/s after 3 min of sustained +3 Gz. The vestibular stimulation by +Gz could result in false subjective perception of attitude, and play a major role in spatial disorientation in flight.
利用带有自由摆动吊舱的4米离心机，研究了高+Gz重力惯性力对人体前庭系统的影响。Gz参数如下：加速度为+0.2 Gz/s，+3 Gz持续3分钟，减速度为-0.2 Gz/s。受试者在两种条件下按随机顺序接受此参数：向前和向后。在这些条件下，垂直半规管平面内的有效角速度是相反的。将这些条件下的慢相速度响应相加仅产生Gz效应；相减仅产生角速度效应。对5名受试者的垂直前庭眼震进行了分析。结果表明，+3 Gz诱发了受试者依赖的垂直眼震，慢相向下。这种眼震的平均幅度在G开始后16秒达到最大值27度/秒，在持续+3 Gz 3分钟后为11度/秒。+Gz引起的前庭刺激可能导致对姿态的错误主观感知，并在飞行空间定向中起主要作用。
