Koenig D E, Hart N W, Hofer H J
University of Houston College of Optometry, 4901 Calhoun Rd., Houston, TX 77204, USA.
Vision Res. 2014 Apr;97:100-7. doi: 10.1016/j.visres.2014.02.010. Epub 2014 Mar 7.
Adaptive optics combined with visual psychophysics creates the potential to study the relationship between visual function and the retina at the cellular scale. This potential is hampered, however, by visual interference from the wavefront-sensing beacon used during correction. For example, we have previously shown that even a dim, visible beacon can alter stimulus perception (Hofer et al., 2012). Here we describe a simple strategy employing a longer wavelength (980nm) beacon that, in conjunction with appropriate restriction on timing and placement, allowed us to perform psychophysics when dark adapted without altering visual perception. The method was verified by comparing detection and color appearance of foveally presented small spot stimuli with and without the wavefront beacon present in 5 subjects. As an important caution, we found that significant perceptual interference can occur even with a subliminal beacon when additional measures are not taken to limit exposure. Consequently, the lack of perceptual interference should be verified for a given system, and not assumed based on invisibility of the beacon.
自适应光学与视觉心理物理学相结合，为在细胞水平研究视觉功能与视网膜之间的关系创造了潜力。然而，这种潜力受到校正过程中使用的波前传感信标产生的视觉干扰的阻碍。例如，我们之前已经表明，即使是一个昏暗的可见信标也会改变刺激感知（霍费尔等人，2012年）。在这里，我们描述了一种简单的策略，即使用更长波长（980纳米）的信标，并结合对时间和位置的适当限制，使我们能够在暗适应状态下进行心理物理学实验，同时不改变视觉感知。通过比较5名受试者在有和没有波前信标的情况下，对中央凹呈现的小光斑刺激的检测和颜色外观，验证了该方法。需要特别注意的是，我们发现，即使是阈下信标，如果不采取额外措施限制暴露，也可能会产生显著的感知干扰。因此，对于给定的系统，应验证是否不存在感知干扰，而不能基于信标的不可见性进行假设。
