Coletta N J, Adams A J
Vision Res. 1986;26(6):917-25. doi: 10.1016/0042-6989(86)90150-1.
Over a large range of light adaptation levels, sensitivity to 25 Hz flicker improves as the light level of the background increases. Using small background discs and annular surrounds, this effect was shown to be mediated by the surround and not the average luminance of the test region, in agreement with recent reports. The effect is due to two types of lateral interaction: at mesopic light levels (from 0.1 to 1.0 td), cone-mediated flicker resolution is enhanced by the stimulation of surrounding rods; at photopic light levels (above 10 td), flicker sensitivity improves with light stimulation of adjacent cones. The spatial zone, or extent, over which the surround contributes to the flicker threshold was measured. The spatial area over which rods influence the cone 25 Hz flicker threshold is larger than the analogous spatial area of cone influence. In the parafovea, at 5 deg eccentricity, cone flicker sensitivity for a 20' spot is influenced by cones in a 1 deg diameter area centered on the spot; the corresponding area of rod influence is about 3 deg. In the fovea, flicker sensitivity for a 10' spot is influenced by cone stimulation in an area of about 20' diameter. Rods which affect foveal flicker sensitivity appear to occupy an annular zone with about a 2 deg outer diameter and 1 deg inner diameter, centered on the fovea.
在大范围的光适应水平下，随着背景光水平的增加，对25赫兹闪烁的敏感度会提高。使用小的背景圆盘和环形周边区域，与最近的报告一致，这种效应被证明是由周边区域介导的，而不是测试区域的平均亮度。这种效应归因于两种类型的侧向相互作用：在中间视觉光水平（0.1至1.0 td）下，周边视杆细胞的刺激会增强视锥细胞介导的闪烁分辨能力；在明视觉光水平（高于10 td）下，相邻视锥细胞的光刺激会提高闪烁敏感度。测量了周边区域对闪烁阈值有贡献的空间范围或程度。视杆细胞影响视锥细胞25赫兹闪烁阈值的空间面积大于视锥细胞影响的类似空间面积。在旁中央凹，在5度偏心度处，对于一个20分视角的光斑，视锥细胞闪烁敏感度受以该光斑为中心的直径1度区域内的视锥细胞影响；视杆细胞影响的相应区域约为3度。在中央凹，对于一个10分视角的光斑，闪烁敏感度受直径约20分视角区域内的视锥细胞刺激影响。影响中央凹闪烁敏感度的视杆细胞似乎占据一个以外径约2度、内径约1度的环形区域，以中央凹为中心。
