Jenks Vestibular Physiology Laboratory, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts; and Department of Otology and Laryngology, Harvard Medical School, Boston, Massachusetts
Jenks Vestibular Physiology Laboratory, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts; and.
J Neurophysiol. 2014 Jun 15;111(12):2393-403. doi: 10.1152/jn.00332.2013. Epub 2013 Dec 26.
Prior studies show that visual motion perception is more precise than vestibular motion perception, but it is unclear whether this is universal or the result of specific experimental conditions. We compared visual and vestibular motion precision over a broad range of temporal frequencies by measuring thresholds for vestibular (subject motion in the dark), visual (visual scene motion) or visual-vestibular (subject motion in the light) stimuli. Specifically, thresholds were measured for motion frequencies spanning a two-decade physiological range (0.05-5 Hz) using single-cycle sinusoidal acceleration roll tilt trajectories (i.e., distinguishing left-side down from right-side down). We found that, while visual and vestibular thresholds were broadly similar between 0.05 and 5.0 Hz, each cue is significantly more precise than the other at certain frequencies. Specifically, we found that 1) visual and vestibular thresholds were indistinguishable at 0.05 Hz and 2 Hz (i.e., similarly precise); 2) visual thresholds were lower (i.e., vision more precise) than vestibular thresholds between 0.1 Hz and 1 Hz; and 3) visual thresholds were higher (i.e., vision less precise) than vestibular thresholds above 2 Hz. This shows that vestibular perception can be more precise than visual perception at physiologically relevant frequencies. We also found that sensory integration of visual and vestibular information is consistent with static Bayesian optimal integration of visual-vestibular cues. In contrast with most prior work that degraded or altered sensory cues, we demonstrated static optimal integration using natural cues.
先前的研究表明，视觉运动知觉比前庭运动知觉更精确，但目前尚不清楚这是普遍现象还是特定实验条件的结果。我们通过测量前庭（受试者在黑暗中运动）、视觉（视觉场景运动）或视-前庭（受试者在光中运动）刺激的阈值，比较了宽范围时间频率下的视觉和前庭运动精度。具体而言，使用单周期正弦加速度滚转角轨迹（即，区分左侧向下和右侧向下），测量跨越两个生理范围（0.05-5 Hz）的运动频率的阈值。我们发现，虽然视觉和前庭阈值在 0.05 到 5.0 Hz 之间广泛相似，但每个线索在某些频率下都明显比另一个更精确。具体来说，我们发现：1）视觉和前庭阈值在 0.05 Hz 和 2 Hz 时无法区分（即，同样精确）；2）在 0.1 Hz 到 1 Hz 之间，视觉阈值低于（即，视觉更精确）前庭阈值；3）在 2 Hz 以上，视觉阈值高于（即，视觉不那么精确）前庭阈值。这表明在生理相关频率下，前庭感知可以比视觉感知更精确。我们还发现，视觉和前庭信息的感觉整合与视觉-前庭线索的静态贝叶斯最优整合一致。与大多数先前降低或改变感觉线索的工作不同，我们使用自然线索证明了静态最优整合。
