Vienne Cyril, Plantier Justin, Neveu Pascaline, Priot Anne-Emmanuelle
Institut de Recherche Biomédicale des Armées, Bretigny sur Orge, France.
Front Neurosci. 2018 Dec 18;12:973. doi: 10.3389/fnins.2018.00973. eCollection 2018.
When looking at objects at various distances in the physical space, the accommodation and vergence systems adjust their parameters to provide a single and clear vision of the world. Subtended muscle activity provides oculomotor cues that can contribute to the perception of depth and distance. While several studies have outlined the role of vergence in distance perception, little is known about the contribution of its concommitant accommodation component. It is possible to unravel the role of each of these physiological systems by placing observers in a situation where there is a conflict between accommodation and vergence distances. We thus sought to determine the contribution of each response system to perceived depth by simultaneously measuring vergence and accommodation while participants judged the depth of 3D stimuli. The distance conflict decreased depth constancy for stimulus displayed with negative disparity steps (divergence). Although vergence was unaffected by the stimulus distance, accommodation responses were significantly reduced when the stimulus was displayed with negative disparities. Our results show that biases in perceived depth follow undershoots in the disparity-driven accommodation response. These findings suggest that accommodation responses (i.e., from oculomotor information) can contribute to perceived depth.
当观察物理空间中不同距离的物体时，调节和聚散系统会调整其参数，以提供对世界的单一清晰视觉。所张肌肉活动提供了动眼线索，有助于深度和距离感知。虽然多项研究概述了聚散在距离感知中的作用，但对其伴随的调节成分的贡献却知之甚少。通过将观察者置于调节距离和聚散距离存在冲突的情境中，可以揭示这些生理系统各自的作用。因此，我们试图通过在参与者判断三维刺激深度的同时测量聚散和调节，来确定每个反应系统对感知深度的贡献。对于以负视差步长（散开）显示的刺激，距离冲突降低了深度恒常性。虽然聚散不受刺激距离的影响，但当刺激以负视差显示时，调节反应会显著降低。我们的结果表明，感知深度的偏差跟随视差驱动的调节反应中的不足。这些发现表明，调节反应（即来自动眼信息）有助于感知深度。
