In most previous studies of observer performance it has been assumed that the observer had complete a priori information about signal parameters and tasks have been performed using spatially constant backgrounds. Results will be presented for more complex tasks including identification of signals from an orthogonal set, signal edge location accuracy, detectability of negative contrast discs and detection of discs on sinusoidal and square wave luminance backgrounds. The effect of digital amplitude quantization will be shown to be predictable by a simple theory. It will also be shown that the standard assumption of a constant observer internal noise is incorrect. It has been found that internal noise is proportional to display noise when the display noise is easily visible. It is proposed that human performance is best described by a sub-optimal Bayesian decision strategy based on maximum a posteriori probabilities.
Arthur E. Burgess,
"Detection And Identification Efficiency: An Update", Proc. SPIE 0535, Application of Optical Instrumentation in Medicine XIII, (11 June 1985); doi: 10.1117/12.947236; https://doi.org/10.1117/12.947236