Simpson William A, Manahilov Velitchko, Shahani Uma
School of Psychology, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK.
Acta Psychol (Amst). 2009 Jun;131(2):93-8. doi: 10.1016/j.actpsy.2009.03.006. Epub 2009 Apr 29.
Classical data on the detection of simple patterns show that two eyes are more sensitive than one eye. The degree of binocular summation is important for inferences about the underlying combination mechanism. In a signal detection theory framework, sensitivity is limited by internal noise. If noise is added centrally after binocular combination, binocular sensitivity is expected to be twice as good as monocular. If the noise is added peripherally at each eye prior to combination, binocular sensitivity will be sqrt[2] higher than monocular. In a large sample of observers (51), we measured contrast sensitivity for detection of gratings at several spatial frequencies using left, right, or both eyes. Estimates of binocular summation using both binocular summation ratios and Minkowski coefficients show a summation ratio with means in the range of 1.5-1.6. The 95% confidence interval overlaps with the value of sqrt[2] predicted by the peripheral noise model and does not overlap with the value of 2 predicted by the central noise model.
关于简单模式检测的经典数据表明，两只眼睛比一只眼睛更敏感。双眼总和的程度对于推断潜在的组合机制很重要。在信号检测理论框架中，灵敏度受内部噪声限制。如果在双眼组合后在中枢添加噪声，预计双眼灵敏度将是单眼的两倍。如果在组合之前在每只眼睛的外周添加噪声，双眼灵敏度将比单眼高√2。在大量观察者样本（51名）中，我们使用左眼、右眼或双眼测量了在几个空间频率下检测光栅的对比灵敏度。使用双眼总和比率和闵可夫斯基系数对双眼总和的估计显示，总和比率的平均值在1.5 - 1.6范围内。95%置信区间与外周噪声模型预测的√2值重叠，与中枢噪声模型预测的2值不重叠。
