Department of Neuroscience, Erasmus MC, Rotterdam, The Netherlands.
Invest Ophthalmol Vis Sci. 2012 Oct 19;53(11):7268-75. doi: 10.1167/iovs.12-9809.
We investigated under what conditions humans can make independent slow phase eye movements. The ability to make independent movements of the two eyes generally is attributed to few specialized lateral eyed animal species, for example chameleons. In our study, we showed that humans also can move the eyes in different directions. To maintain binocular retinal correspondence independent slow phase movements of each eye are produced.
We used the scleral search coil method to measure binocular eye movements in response to dichoptically viewed visual stimuli oscillating in orthogonal direction.
Correlated stimuli led to orthogonal slow eye movements, while the binocularly perceived motion was the vector sum of the motion presented to each eye. The importance of binocular fusion on independency of the movements of the two eyes was investigated with anti-correlated stimuli. The perceived global motion pattern of anti-correlated dichoptic stimuli was perceived as an oblique oscillatory motion, as well as resulted in a conjugate oblique motion of the eyes.
We propose that the ability to make independent slow phase eye movements in humans is used to maintain binocular retinal correspondence. Eye-of-origin and binocular information are used during the processing of binocular visual information, and it is decided at an early stage whether binocular or monocular motion information and independent slow phase eye movements of each eye are produced during binocular tracking.
我们研究了在什么条件下人类可以进行独立的缓慢相眼动。通常，具有这种将双眼向不同方向独立运动能力的动物物种很少，例如变色龙。在我们的研究中，我们表明人类也可以使眼睛向不同方向运动。为了保持双眼视网膜对应，需要产生独立的缓慢相眼动。
我们使用巩膜搜索线圈法测量双眼对呈现在正交方向上的双眼视觉刺激的反应性眼动。
相关刺激会导致双眼向正交方向的缓慢运动，而双眼感知到的运动是呈现给每只眼睛的运动的矢量和。我们用反相关刺激来研究双眼融合对视动独立性的重要性。反相关双眼视觉刺激的整体感知运动模式被感知为斜向振荡运动，并且导致眼睛的共轭斜向运动。
我们提出，人类进行独立的缓慢相眼动的能力用于维持双眼视网膜对应。在处理双眼视觉信息时，眼起源和双眼信息都被使用，并且在双眼跟踪过程中，决定了产生双眼运动信息还是单眼运动信息以及每只眼睛的独立缓慢相眼动。
