Whitaker D, Latham K, Mäkelä P, Rovamo J
Department of Vision Sciences, Aston University, Birmingham, England.
Vision Res. 1993 Nov;33(16):2215-24. doi: 10.1016/0042-6989(93)90101-2.
Curvature detection and discrimination were measured across the visual field in order to determine whether performance at a given eccentricity could be related to that at another by a simple change of magnification. Both types of task obeyed this concept, the critical variable being the rate at which magnification must increase as a function of eccentricity. The situation can be expressed in terms of the eccentricity (E2) at which magnification must be doubled to retain performance equivalent to that at the fovea. E2 values were 1.84-1.96 deg for the detection task and 1.42-2.27 deg for discrimination. These are similar to E2 values for vernier acuity and orientation discrimination, suggesting that all of these tasks share a common determining feature across the visual field, perhaps the distribution of neural elements selective for stimulus orientation.
为了确定在给定偏心率下的表现是否可以通过简单的放大倍数变化与另一偏心率下的表现相关联，我们在整个视野中测量了曲率检测和辨别能力。两种类型的任务都遵循这一概念，关键变量是放大倍数必须随偏心率增加的速率。这种情况可以用偏心率（E2）来表示，即在该偏心率下放大倍数必须加倍才能保持与中央凹处相当的表现。检测任务的E2值为1.84 - 1.96度，辨别任务的E2值为1.42 - 2.27度。这些值与游标视力和方向辨别任务的E2值相似，这表明所有这些任务在整个视野中都具有一个共同的决定性特征，可能是对刺激方向具有选择性的神经元素的分布。
