Määttänen L M, Koenderink J J, Nienhuis B
Department of Medical and Physiological Physics, State University Utrecht, The Netherlands.
Vision Res. 1988;28(7):811-8. doi: 10.1016/0042-6989(88)90028-4.
Contrast discrimination thresholds were measured for 2-dimensional difference-of-Gaussian stimuli using a spatial 2-alternative forced-choice method. The stimulus diameter was varied from 0.4 to 3 deg and the distance between the centres of stimuli from 1 to 12 deg. When the two stimuli were presented on opposite sides of the fixation point on the horizontal meridian the discrimination thresholds were invariant to stimulus size and distance. When the stimulus configuration was vertical and moved to the temporal visual field, the discrimination thresholds were found to depend slightly on the inter-stimulus distance. A high-contrast bar placed between the stimuli did not influence the discrimination sensitivity.
使用空间二选一强制选择法测量了二维高斯差分刺激的对比度辨别阈值。刺激直径从0.4度变化到3度，刺激中心之间的距离从1度变化到12度。当两个刺激在水平子午线上的注视点两侧呈现时，辨别阈值与刺激大小和距离无关。当刺激配置为垂直且移至颞侧视野时，发现辨别阈值略微依赖于刺激间距离。置于刺激之间的高对比度条不会影响辨别灵敏度。
