Institute for Experimental Psychology, Heinrich-Heine-University Düsseldorf, Germany.
J Neurophysiol. 2023 Aug 1;130(2):447-457. doi: 10.1152/jn.00157.2023. Epub 2023 Jul 19.
Every time we move our head, the brain must decide whether the displacement of the visual scene is the result of external or self-produced motion. Gaze shifts generate the biggest and most frequent disturbance of vision. Visual stability during gaze shifts is necessary for both, dissociating self-produced from external motion and retaining bodily balance. Here, we asked participants to perform an eye-head gaze shift to a target that was briefly presented in a head-mounted display. We manipulated the velocity of the scene displacement across trials such that the background moved either too fast or too slow in relation to the head movement speed. Participants were required to report whether they perceived the gaze-contingent visual motion as faster or slower than what they would expect from their head movement velocity. We found that the point of visual stability was attracted to the velocity presented in the previous trial. Our data reveal that serial dependencies in visual stability calibrate the mapping between motor-related signals coding head movement velocity and visual motion velocity. This process is likely to aid in visual stability as the accuracy of this mapping is crucial to maintain visual stability during self-motion. We report that visual stability during self-motion is maintained by serial dependencies between the current and the previous gaze-contingent visual velocity that was experienced during a head movement. The gaze-contingent scene displacement velocity that appears normal to us thus depends on what we have registered in the recent history of gaze shifts. Serial dependencies provide an efficient means to maintain visual stability during self-motion.
每次我们移动头部时，大脑必须决定视觉场景的位移是外部产生还是自身产生的运动的结果。注视转移会产生最大和最频繁的视觉干扰。在注视转移期间保持视觉稳定对于区分自身运动和外部运动以及保持身体平衡都是必要的。在这里，我们要求参与者将目光和头部一起转移到一个在头戴式显示器中短暂呈现的目标上。我们在试验中操纵场景位移的速度，使得背景相对于头部移动速度过快或过慢。参与者需要报告他们是否感觉到与注视相关的视觉运动比他们从头部移动速度中预期的更快或更慢。我们发现视觉稳定点被吸引到前一个试验中呈现的速度。我们的数据表明，视觉稳定性的序列依赖性校准了编码头部移动速度和视觉运动速度的运动相关信号之间的映射。这个过程可能有助于视觉稳定性，因为这种映射的准确性对于在自身运动期间保持视觉稳定性至关重要。我们报告说，通过当前和前一个头部运动期间经历的与注视相关的视觉速度之间的序列依赖性，在自身运动期间保持视觉稳定性。因此，对我们来说正常的与注视相关的场景位移速度取决于我们在最近的注视转移历史中记录的内容。序列依赖性为在自身运动期间保持视觉稳定性提供了一种有效的手段。
