Eskew R T, Stromeyer C F, Picotte C J, Kronauer R E
Division of Applied Sciences, Harvard University, Cambridge, Massachusetts 02138.
J Opt Soc Am A. 1991 Feb;8(2):394-403. doi: 10.1364/josaa.8.000394.
A suprathreshold luminance flash (1 degree, 200 msec) on a large uniform yellow field facilitates detection of a coincident (1 degree, 200 msec) red or green equiluminant flash and approximately linearizes the psychometric function for detecting the chromatic flash. The facilitation is produced by the suprathreshold contour created by the luminance flash. We tested whether the contour facilitates detection by reducing spatiotemporal uncertainty in detecting the chromatic flash. Uncertainty increase false alarms, and this effect can be factored out by correcting yes-no psychometric functions for guessing. Uncertainty also alters the shape of the receiver operating characteristic. Measurements of yes-no psychometric functions and receiver operating characteristics do not support the uncertainty reduction hypothesis.
在大面积均匀黄色背景上的阈上亮度闪光（1度，200毫秒）有助于检测同时出现的（1度，200毫秒）红色或绿色等亮度闪光，并使检测该彩色闪光的心理测量函数大致呈线性。这种促进作用是由亮度闪光产生的阈上轮廓所导致的。我们测试了该轮廓是否通过减少检测彩色闪光时的时空不确定性来促进检测。不确定性会增加误报，而这种影响可以通过对是-否心理测量函数进行猜测校正来排除。不确定性还会改变接收者操作特征的形状。对是-否心理测量函数和接收者操作特征的测量结果不支持不确定性降低假说。
