Motor Signals Mediate Stationarity Perception
Motor Signals Mediate Stationarity Perception
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DOI：
10.1163/22134808-bja10111
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发表时间：
2023-11-01
影响因子：
1.6
通讯作者：
Macneilage, Paul R.
中科院分区：
文献类型：
--
作者：
Halow, Savannah;Liu, James;Macneilage, Paul R.
头部相对于静止环境的运动产生一致的前庭和视觉光流信号。所得到的静止视觉环境的感知，在本文中被称为平稳性感知，取决于比较视觉和前庭信号以评估它们的一致性的机制。在这里，我们调查这些机制的功能和他们的依赖固定行为，以及对头部运动的主动与被动的性质。平稳性感知是通过修改个体试验中相对于头部运动的视觉运动增益来测量的，并要求受试者报告增益是否太低或太高。将心理测量函数拟合到数据中会产生两个关键的性能参数。平均值是准确度的度量，标准差是精确度的度量。实验是使用一个头戴式显示器进行的，固定行为由一个嵌入式眼动仪监测。在活动条件下，受试者在-1 s内以-15 deg/s的偏航速度旋转头部。在被动条件下，每个受试者的动作被记录并通过旋转椅子回放。在头部固定和场景固定的固定期间，固定目标分别随着头部或场景移动。主动头部运动的精确度和准确度均优于被动头部运动，这可能是由于运动预测和颈部本体感受引起的头部运动估计的精确度提高。在场景固定期间的性能也优于头部固定固定，这可能是由于视网膜图像运动的速度降低和视网膜图像运动估计的精度提高。这些结果揭示了头部和眼球运动的性质如何介导相关感觉和运动信号的编码、处理和比较。
Head movement relative to the stationary environment gives rise to congruent vestibular and visual optic-flow signals. The resulting perception of a stationary visual environment, referred to herein as stationarity perception, depends on mechanisms that compare visual and vestibular signals to evaluate their congruence. Here we investigate the functioning of these mechanisms and their dependence on fixation behavior as well as on the active versus passive nature of the head movement. Stationarity perception was measured by modifying the gain on visual motion relative to head movement on individual trials and asking subjects to report whether the gain was too low or too high. Fitting a psychometric function to the data yields two key parameters of performance. The mean is a measure of accuracy, and the standard deviation is a measure of precision. Experiments were conducted using a head-mounted display with fixation behavior monitored by an embedded eye tracker. During active conditions, subjects rotated their heads in yaw -15 deg/s over -1 s. Each subject's movements were recorded and played back via rotating chair during the passive condition. During head-fixed and scene-fixed fixation the fixation target moved with the head or scene, respectively. Both precision and accuracy were better during active than passive head movement, likely due to increased precision on the head movement estimate arising from motor prediction and neck proprioception. Performance was also better during scene-fixed than head-fixed fixation, perhaps due to decreased velocity of retinal image motion and increased precision on the retinal image motion estimate. These results reveal how the nature of head and eye movements mediate encoding, processing, and comparison of relevant sensory and motor signals.