Ejima Y, Takahashi S
J Opt Soc Am. 1983 Dec;73(12):1695-700. doi: 10.1364/josa.73.001695.
Detection thresholds of sinusoidal gratings in the simultaneous presence of high-contrast peripheral masking stimuli partially overlapping the test gratings were determined as a function of the separation between the center of the test grating and the peripheral stimulus by a two-alternative forced-choice method. The results showed that the threshold-elevating effect of simultaneously present peripheral masking stimuli depends on how much of the test grating is left unexposed. An additional experiment, in which the detection thresholds in the absence of the peripheral stimulus were determined as a function of the number of cycles of the test grating, enabled us to show that the threshold-elevating effect is somewhat higher than the effect of simply cutting the test grating down in size. The threshold-elevating effects caused by high-contrast peripheral masking stimuli can be explained in terms of a lateral inhibition and a probability summation across space, taking into account the nonuniform sensitivity across the visual field.
通过二选一的强制选择法，确定了在同时存在与测试光栅部分重叠的高对比度周边掩蔽刺激时，正弦光栅的检测阈值与测试光栅中心和周边刺激之间距离的函数关系。结果表明，同时存在的周边掩蔽刺激的阈值升高效应取决于测试光栅未被遮挡的部分。另外一项实验确定了在没有周边刺激时检测阈值与测试光栅周期数的函数关系，该实验使我们能够表明，阈值升高效应略高于简单减小测试光栅尺寸所产生的效应。考虑到整个视野的敏感度不均匀，高对比度周边掩蔽刺激所引起的阈值升高效应可以用侧向抑制和空间概率总和来解释。
