Shelhamer Mark, Clendaniel Richard A, Roberts Dale C
Department of Otolaryngology-Head & Neck Surgery, Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
J Vestib Res. 2002;12(5-6):211-21.
Previous studies established that vestibular reflexes can have two adapted states (e.g., gains) simultaneously, and that a context cue (e.g., vertical eye position) can switch between the two states. Our earlier work demonstrated this phenomenon of context-specific adaptation for saccadic eye movements: we asked for gain decrease in one context state and gain increase in another context state, and then determined if a change in the context state would invoke switching between the adapted states. Horizontal and vertical eye position and head orientation could serve, to varying degrees, as cues for switching between two different saccade gains. In the present study, we asked whether gravity magnitude could serve as a context cue: saccade adaptation was performed during parabolic flight, which provides alternating levels of gravitoinertial force (0 g and 1.8 g). Results were less robust than those from ground experiments, but established that different saccade magnitudes could be associated with different gravity levels.
先前的研究表明，前庭反射可以同时具有两种适应状态（例如，增益），并且一个情境线索（例如，垂直眼位）可以在这两种状态之间切换。我们早期的工作证明了这种针对眼球扫视运动的情境特异性适应现象：我们要求在一种情境状态下降低增益，而在另一种情境状态下增加增益，然后确定情境状态的变化是否会引发适应状态之间的切换。水平和垂直眼位以及头部方向在不同程度上可以作为两种不同扫视增益之间切换的线索。在本研究中，我们询问重力大小是否可以作为一种情境线索：在抛物线飞行期间进行扫视适应，抛物线飞行提供了交替的重力惯性力水平（0g和1.8g）。结果不如地面实验的结果那么可靠，但证实了不同的扫视幅度可以与不同的重力水平相关联。
