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首页> 外文期刊>Journal of Neurophysiology >Saccadic compensation for smooth eye and head movements during head-unrestrained two-dimensional tracking.
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Saccadic compensation for smooth eye and head movements during head-unrestrained two-dimensional tracking.

机译：在头部不受限制的二维跟踪过程中，对眼部和头部的平稳移动进行声场补偿。

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摘要

Spatial updating is the ability to keep track of the position of world-fixed objects while we move. In the case of vision, this phenomenon is called spatial constancy and has been studied in head-restraint conditions. During head-restrained smooth pursuit, it has been shown that the saccadic system has access to extraretinal information from the pursuit system to update the objects' position in the surrounding environment. However, during head-unrestrained smooth pursuit, the saccadic system needs to keep track of three different motor commands: the ocular smooth pursuit command, the vestibuloocular reflex (VOR), and the head movement command. The question then arises whether saccades compensate for these movements. To address this question, we briefly presented a target during sinusoidal head-unrestrained smooth pursuit in darkness. Subjects were instructed to look at the flash as soon as they saw it. We observed that subjects were able to orient their gaze to the memorized (and spatially updated) position of the flashed target generally using one to three successive saccades. Similar to the behavior in the head-restrained condition, we found that the longer the gaze saccade latency, the better the compensation for intervening smooth gaze displacements; after about 400 ms, 62% of the smooth gaze displacement had been compensated for. This compensation depended on two independent parameters: the latency of the saccade and the eye contribution to the gaze displacement during this latency period. Separating gaze into eye and head contributions, we show that the larger the eye contribution to the gaze displacement, the better the overall compensation. Finally, we found that the compensation was a function of the head oscillation frequency and we suggest that this relationship is linked to the modulation of VOR gain. We conclude that the general mechanisms of compensation for smooth gaze displacements are similar to those observed in the head-restrained condition.
机译：空间更新是一种在我们移动时跟踪世界固定对象的位置的能力。就视觉而言，这种现象称为空间恒定性，并已在头部约束条件下进行了研究。在限制头部的顺畅跟踪过程中，已表明，眼跳系统可以从跟踪系统访问视网膜外信息，以更新物体在周围环境中的位置。但是，在无限制地进行头部平稳顺畅追踪时，眼跳系统需要跟踪三种不同的运动命令：眼部平稳追踪命令，前庭眼反射（VOR）和头部运动命令。随之而来的问题是，扫视是否能补偿这些运动。为了解决这个问题，我们简要介绍了在黑暗中正弦波头部不受约束的平稳追逐过程中的目标。指示受试者在看到闪光灯后立即看一下闪光灯。我们观察到，受试者通常能够使用一到三个连续的扫视镜将视线对准闪光目标的记忆（和空间更新）位置。与头部约束条件下的行为类似，我们发现凝视扫视潜伏期越长，对平稳的凝视位移进行补偿的效果就越好。大约400毫秒后，平滑注视位移的62％已得到补偿。这种补偿取决于两个独立的参数：扫视的潜伏期和在此潜伏期中眼睛对凝视位移的贡献。将视线分为眼部和头部贡献，我们发现眼部对视线位移的贡献越大，总体补偿就越好。最后，我们发现补偿是磁头振荡频率的函数，并且我们建议这种关系与VOR增益的调制有关。我们得出的结论是，对平滑视线位移进行补偿的一般机制与在头部约束条件下观察到的机制相似。

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